diff --git a/compiler/rustc_privacy/messages.ftl b/compiler/rustc_privacy/messages.ftl
index 7785f1a7f81fb..e6b96d7f1bfd3 100644
--- a/compiler/rustc_privacy/messages.ftl
+++ b/compiler/rustc_privacy/messages.ftl
@@ -8,6 +8,7 @@ privacy_from_private_dep_in_public_interface =
 privacy_in_public_interface = {$vis_descr} {$kind} `{$descr}` in public interface
     .label = can't leak {$vis_descr} {$kind}
     .visibility_label = `{$descr}` declared as {$vis_descr}
+    .suggestion = consider adding `{$vis_sugg}` in front of it
 
 privacy_item_is_private = {$kind} `{$descr}` is private
     .label = private {$kind}
diff --git a/compiler/rustc_privacy/src/errors.rs b/compiler/rustc_privacy/src/errors.rs
index ee04c335f2bd1..613dab8c73660 100644
--- a/compiler/rustc_privacy/src/errors.rs
+++ b/compiler/rustc_privacy/src/errors.rs
@@ -48,6 +48,7 @@ pub struct UnnamedItemIsPrivate {
 }
 
 #[derive(Diagnostic)]
+#[help]
 #[diag(privacy_in_public_interface, code = E0446)]
 pub struct InPublicInterface<'a> {
     #[primary_span]
@@ -58,6 +59,9 @@ pub struct InPublicInterface<'a> {
     pub descr: DiagArgFromDisplay<'a>,
     #[label(privacy_visibility_label)]
     pub vis_span: Span,
+    #[suggestion(code = "{vis_sugg}", applicability = "maybe-incorrect", style = "verbose")]
+    pub data: Span,
+    pub vis_sugg: &'static str,
 }
 
 #[derive(Diagnostic)]
diff --git a/compiler/rustc_privacy/src/lib.rs b/compiler/rustc_privacy/src/lib.rs
index a78f7e65981ab..f9ba99dd8127a 100644
--- a/compiler/rustc_privacy/src/lib.rs
+++ b/compiler/rustc_privacy/src/lib.rs
@@ -1337,12 +1337,31 @@ impl SearchInterfaceForPrivateItemsVisitor<'_> {
                 }
             };
 
+            // FIXME: this code was adapted from the above `vis_descr` computation,
+            //        but it's not clear if it's correct.
+            let vis_sugg = match self.required_visibility {
+                ty::Visibility::Public => "pub",
+                ty::Visibility::Restricted(vis_def_id) => {
+                    if vis_def_id
+                        == self.tcx.parent_module_from_def_id(local_def_id).to_local_def_id()
+                    {
+                        "???FIXME???"
+                    } else if vis_def_id.is_top_level_module() {
+                        "pub(crate)"
+                    } else {
+                        "???FIXME???"
+                    }
+                }
+            };
+
             self.tcx.dcx().emit_err(InPublicInterface {
                 span,
                 vis_descr,
                 kind,
                 descr: descr.into(),
                 vis_span,
+                data: vis_span,
+                vis_sugg,
             });
             return false;
         }
diff --git a/tests/ui/const-generics/generic_const_exprs/eval-privacy.stderr b/tests/ui/const-generics/generic_const_exprs/eval-privacy.stderr
index 043fa34d605ab..51749adc90975 100644
--- a/tests/ui/const-generics/generic_const_exprs/eval-privacy.stderr
+++ b/tests/ui/const-generics/generic_const_exprs/eval-privacy.stderr
@@ -6,6 +6,11 @@ LL |     type AssocTy = Const<{ my_const_fn(U) }>;
 ...
 LL | const fn my_const_fn(val: u8) -> u8 {
    | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private
+   |
+help: consider adding `pub` in front of it
+   |
+LL | pub {
+   | ~~~
 
 error: aborting due to 1 previous error
 
diff --git a/tests/ui/error-codes/E0446.stderr b/tests/ui/error-codes/E0446.stderr
index 2951e69d1c263..4ca98ac63b403 100644
--- a/tests/ui/error-codes/E0446.stderr
+++ b/tests/ui/error-codes/E0446.stderr
@@ -6,6 +6,11 @@ LL | struct Bar;
 ...
 LL |     type Alias1 = Bar;
    |     ^^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL | pub;
+   | ~~~
 
 error[E0446]: private trait `PrivTr` in public interface
   --> $DIR/E0446.rs:11:5
@@ -15,6 +20,11 @@ LL | trait PrivTr {}
 ...
 LL |     type Alias2 = Box<dyn PrivTr>;
    |     ^^^^^^^^^^^ can't leak private trait
+   |
+help: consider adding `pub` in front of it
+   |
+LL | pub {}
+   | ~~~
 
 error: aborting due to 2 previous errors
 
diff --git a/tests/ui/privacy/issue-30079.stderr b/tests/ui/privacy/issue-30079.stderr
index f1facba7cd230..db5c546eadbe2 100644
--- a/tests/ui/privacy/issue-30079.stderr
+++ b/tests/ui/privacy/issue-30079.stderr
@@ -19,6 +19,11 @@ LL |     struct Priv;
 LL |     impl ::std::ops::Deref for ::SemiPriv {
 LL |         type Target = Priv;
    |         ^^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub(crate)` in front of it
+   |
+LL |     pub(crate);
+   |     ~~~~~~~~~~
 
 error[E0446]: private type `m3::Priv` in public interface
   --> $DIR/issue-30079.rs:34:9
@@ -28,6 +33,11 @@ LL |     struct Priv;
 LL |     impl ::SemiPrivTrait for () {
 LL |         type Assoc = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub(crate)` in front of it
+   |
+LL |     pub(crate);
+   |     ~~~~~~~~~~
 
 error: aborting due to 2 previous errors; 1 warning emitted
 
diff --git a/tests/ui/privacy/private-in-public-assoc-ty.stderr b/tests/ui/privacy/private-in-public-assoc-ty.stderr
index 0931e6d9971ea..7f9e19a899fc1 100644
--- a/tests/ui/privacy/private-in-public-assoc-ty.stderr
+++ b/tests/ui/privacy/private-in-public-assoc-ty.stderr
@@ -6,6 +6,11 @@ LL |     struct Priv;
 ...
 LL |         type A = Priv;
    |         ^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 warning: trait `PrivTr` is more private than the item `PubTr::Alias1`
   --> $DIR/private-in-public-assoc-ty.rs:24:9
@@ -52,6 +57,11 @@ LL |     struct Priv;
 ...
 LL |         type Alias4 = Priv;
    |         ^^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error[E0446]: private type `Priv` in public interface
   --> $DIR/private-in-public-assoc-ty.rs:38:9
@@ -61,6 +71,11 @@ LL |     struct Priv;
 ...
 LL |         type Alias1 = Priv;
    |         ^^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error[E0446]: private trait `PrivTr` in public interface
   --> $DIR/private-in-public-assoc-ty.rs:41:9
@@ -70,6 +85,11 @@ LL |     trait PrivTr {}
 ...
 LL |         type Exist = impl PrivTr;
    |         ^^^^^^^^^^ can't leak private trait
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub {}
+   |     ~~~
 
 error: aborting due to 4 previous errors; 3 warnings emitted
 
diff --git a/tests/ui/privacy/private-in-public-warn.stderr b/tests/ui/privacy/private-in-public-warn.stderr
index ac7e5547de914..69bbf33b7786b 100644
--- a/tests/ui/privacy/private-in-public-warn.stderr
+++ b/tests/ui/privacy/private-in-public-warn.stderr
@@ -59,6 +59,11 @@ LL |     struct Priv;
 ...
 LL |         type Alias = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error: type `types::Priv` is more private than the item `Tr::f1`
   --> $DIR/private-in-public-warn.rs:23:9
@@ -128,6 +133,11 @@ LL |     struct Priv;
 ...
 LL |         type Alias = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error: trait `traits::PrivTr` is more private than the item `traits::Alias`
   --> $DIR/private-in-public-warn.rs:41:5
@@ -310,6 +320,11 @@ LL |     struct Priv;
 ...
 LL |         type Alias = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error: type `aliases_pub::Priv` is more private than the item `aliases_pub::<impl Pub2>::f`
   --> $DIR/private-in-public-warn.rs:180:9
@@ -331,6 +346,11 @@ LL |     struct Priv;
 ...
 LL |         type Check = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error[E0446]: private type `aliases_pub::Priv` in public interface
   --> $DIR/private-in-public-warn.rs:186:9
@@ -340,6 +360,11 @@ LL |     struct Priv;
 ...
 LL |         type Check = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error[E0446]: private type `aliases_pub::Priv` in public interface
   --> $DIR/private-in-public-warn.rs:189:9
@@ -349,6 +374,11 @@ LL |     struct Priv;
 ...
 LL |         type Check = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error[E0446]: private type `aliases_pub::Priv` in public interface
   --> $DIR/private-in-public-warn.rs:192:9
@@ -358,6 +388,11 @@ LL |     struct Priv;
 ...
 LL |         type Check = Priv;
    |         ^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error: trait `PrivTr1` is more private than the item `aliases_priv::Tr1`
   --> $DIR/private-in-public-warn.rs:222:5
diff --git a/tests/ui/privacy/private-inferred-type.stderr b/tests/ui/privacy/private-inferred-type.stderr
index fc3f9ab62bfa9..2552ef32bed87 100644
--- a/tests/ui/privacy/private-inferred-type.stderr
+++ b/tests/ui/privacy/private-inferred-type.stderr
@@ -6,6 +6,11 @@ LL |     struct Priv;
 ...
 LL |     impl TraitWithAssocTy for u8 { type AssocTy = Priv; }
    |                                    ^^^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error[E0446]: private type `S2` in public interface
   --> $DIR/private-inferred-type.rs:83:9
@@ -15,6 +20,11 @@ LL |     struct S2;
 ...
 LL |         type Target = S2Alias;
    |         ^^^^^^^^^^^ can't leak private type
+   |
+help: consider adding `pub` in front of it
+   |
+LL |     pub;
+   |     ~~~
 
 error: type `Priv` is private
   --> $DIR/private-inferred-type.rs:97:9
diff --git a/tests/ui/privacy/where-priv-type.stderr b/tests/ui/privacy/where-priv-type.stderr
index 126330b14a63f..7a53b609e81bd 100644
--- a/tests/ui/privacy/where-priv-type.stderr
+++ b/tests/ui/privacy/where-priv-type.stderr
@@ -76,6 +76,11 @@ LL |     type AssocTy = Const<{ my_const_fn(U) }>;
 ...
 LL | const fn my_const_fn(val: u8) -> u8 {
    | ----------------------------------- `fn(u8) -> u8 {my_const_fn}` declared as private
+   |
+help: consider adding `pub` in front of it
+   |
+LL | pub {
+   | ~~~
 
 error: aborting due to 1 previous error; 5 warnings emitted