diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1faacf53..4abf2d2a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ Supported `polkadot-sdk` rev: `2503.0.1`
 - The `emsdk` version is now `4.0.9`
 
 ### Fixed
+- The LLVM builder with newer toolchains.
 
 ## v0.1.0-dev.16
 
diff --git a/crates/llvm-builder/src/platforms/shared.rs b/crates/llvm-builder/src/platforms/shared.rs
index 38362ce5..45e881ba 100644
--- a/crates/llvm-builder/src/platforms/shared.rs
+++ b/crates/llvm-builder/src/platforms/shared.rs
@@ -8,8 +8,9 @@ use std::path::Path;
 use std::process::Command;
 
 /// The build options shared by all platforms.
-pub const SHARED_BUILD_OPTS: [&str; 21] = [
+pub const SHARED_BUILD_OPTS: [&str; 22] = [
     "-DPACKAGE_VENDOR='Parity Technologies'",
+    "-DCMAKE_CXX_FLAGS='-include cstdint -include stdint.h'",
     "-DCMAKE_BUILD_WITH_INSTALL_RPATH=1",
     "-DLLVM_BUILD_DOCS='Off'",
     "-DLLVM_INCLUDE_DOCS='Off'",