diff --git a/cxxheaderparser/lexer.py b/cxxheaderparser/lexer.py
index 17caf92..e0b23cc 100644
--- a/cxxheaderparser/lexer.py
+++ b/cxxheaderparser/lexer.py
@@ -111,6 +111,10 @@ class PlyLexer:
         "__inline",
         "inline",
         "int",
+        "__int8",
+        "__int16",
+        "__int32",
+        "__int64",
         "long",
         "mutable",
         "namespace",
diff --git a/cxxheaderparser/parser.py b/cxxheaderparser/parser.py
index 41b7a54..8582f07 100644
--- a/cxxheaderparser/parser.py
+++ b/cxxheaderparser/parser.py
@@ -1514,6 +1514,10 @@ def _parse_pqname_decltype_specifier(self) -> DecltypeSpecifier:
         "float",
         "double",
         "char",
+        "__int8",
+        "__int16",
+        "__int32",
+        "__int64"
     }
 
     _fundamentals = _compound_fundamentals | {
@@ -1522,7 +1526,7 @@ def _parse_pqname_decltype_specifier(self) -> DecltypeSpecifier:
         "char32_t",
         "nullptr_t",
         "wchar_t",
-        "void",
+        "void"
     }
 
     def _parse_pqname_fundamental(self, tok_value: str) -> FundamentalSpecifier:
diff --git a/tests/test_msvc_types.py b/tests/test_msvc_types.py
new file mode 100644
index 0000000..bf08bb2
--- /dev/null
+++ b/tests/test_msvc_types.py
@@ -0,0 +1,56 @@
+from cxxheaderparser.types import (
+    Function,
+    Type,
+    PQName,
+    NameSpecifier,
+)
+from cxxheaderparser.simple import (
+    NamespaceScope,
+    parse_string,
+    ParsedData,
+)
+
+
+def test_msvc_types() -> None:
+    content = """
+      __int64 test_int64();
+      __int32 test_int32();
+      __int16 test_int16();
+      __int8 test_int8();
+    """
+    data = parse_string(content, cleandoc=True)
+
+    assert data == ParsedData(
+        namespace=NamespaceScope(
+            functions=[
+                Function(
+                    return_type=Type(
+                        typename=PQName(segments=[NameSpecifier(name="__int64")])
+                    ),
+                    name=PQName(segments=[NameSpecifier(name="test_int64")]),
+                    parameters=[],
+                ),
+                Function(
+                    return_type=Type(
+                        typename=PQName(segments=[NameSpecifier(name="__int32")])
+                    ),
+                    name=PQName(segments=[NameSpecifier(name="test_int32")]),
+                    parameters=[],
+                ),
+                Function(
+                    return_type=Type(
+                        typename=PQName(segments=[NameSpecifier(name="__int16")])
+                    ),
+                    name=PQName(segments=[NameSpecifier(name="test_int16")]),
+                    parameters=[],
+                ),
+                Function(
+                    return_type=Type(
+                        typename=PQName(segments=[NameSpecifier(name="__int8")])
+                    ),
+                    name=PQName(segments=[NameSpecifier(name="test_int8")]),
+                    parameters=[],
+                ),
+            ]
+        )
+    )