diff --git a/core-foundation-sys/src/attributed_string.rs b/core-foundation-sys/src/attributed_string.rs
index ecdffe6..c91bf5b 100644
--- a/core-foundation-sys/src/attributed_string.rs
+++ b/core-foundation-sys/src/attributed_string.rs
@@ -52,5 +52,4 @@ extern {
         value: CFTypeRef,
     );
 
-    pub fn CFMutableAttributedStringGetTypeID() -> CFTypeID;
 }
diff --git a/core-foundation/src/attributed_string.rs b/core-foundation/src/attributed_string.rs
index e0fa576..c99775d 100644
--- a/core-foundation/src/attributed_string.rs
+++ b/core-foundation/src/attributed_string.rs
@@ -41,7 +41,7 @@ impl CFAttributedString {
 declare_TCFType!{
     CFMutableAttributedString, CFMutableAttributedStringRef
 }
-impl_TCFType!(CFMutableAttributedString, CFMutableAttributedStringRef, CFMutableAttributedStringGetTypeID);
+impl_TCFType!(CFMutableAttributedString, CFMutableAttributedStringRef, CFAttributedStringGetTypeID);
 
 impl CFMutableAttributedString {
     #[inline]
@@ -83,3 +83,16 @@ impl Default for CFMutableAttributedString {
         Self::new()
     }
 }
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn attributed_string_type_id_comparison() {
+        // CFMutableAttributedString TypeID must be equal to CFAttributedString TypeID.
+        // Compilation must not fail.
+        assert_eq!(<CFAttributedString as TCFType>::type_id(), <CFMutableAttributedString as TCFType>::type_id());
+    }
+}
\ No newline at end of file