diff --git a/gen/include.rs b/gen/include.rs
index e3a9dd790..8f38fe385 100644
--- a/gen/include.rs
+++ b/gen/include.rs
@@ -38,6 +38,7 @@ pub struct Includes {
     pub string: bool,
     pub type_traits: bool,
     pub utility: bool,
+    pub base_tsd: bool,
 }
 
 impl Includes {
@@ -88,6 +89,11 @@ impl Display for Includes {
         if self.utility {
             writeln!(f, "#include <utility>")?;
         }
+        if self.base_tsd {
+            writeln!(f, "#if defined(_WIN32)")?;
+            writeln!(f, "#include <BaseTsd.h>")?;
+            writeln!(f, "#endif")?;
+        }
         if *self != Self::default() {
             writeln!(f)?;
         }
diff --git a/gen/write.rs b/gen/write.rs
index 9d6ef6e45..d80e95795 100644
--- a/gen/write.rs
+++ b/gen/write.rs
@@ -126,6 +126,7 @@ fn write_include_cxxbridge(out: &mut OutFile, apis: &[Api], types: &Types) {
                 needs_rust_fn = true;
             }
             ty if ty == Isize => {
+                out.include.base_tsd = true;
                 needs_rust_isize = true;
             }
             ty if ty == RustString => {