diff --git a/src/generators/hl2c.ml b/src/generators/hl2c.ml
index 8c863f5535d..4f7c458a7b5 100644
--- a/src/generators/hl2c.ml
+++ b/src/generators/hl2c.ml
@@ -1144,7 +1144,7 @@ let make_types_idents htypes =
 	in
 	let hashes = Hashtbl.create 0 in
 	let make_sign d =
-		let dig = Digest.to_hex (Digest.bytes (Marshal.to_bytes d [Marshal.Compat_32])) in
+		let dig = Digest.to_hex (Digest.bytes (Marshal.to_bytes d [Marshal.Closures])) in
 		let h = String.sub dig 0 7 in
 		let h = if Hashtbl.mem hashes h then dig else h in
 		Hashtbl.add hashes h ();
diff --git a/tests/misc/hl/projects/Issue11689/Main.hx b/tests/misc/hl/projects/Issue11689/Main.hx
new file mode 100644
index 00000000000..f641935105d
--- /dev/null
+++ b/tests/misc/hl/projects/Issue11689/Main.hx
@@ -0,0 +1,2 @@
+function foo(val:hl.Ref<String>) {}
+function main() {}
\ No newline at end of file
diff --git a/tests/misc/hl/projects/Issue11689/compile.hxml b/tests/misc/hl/projects/Issue11689/compile.hxml
new file mode 100644
index 00000000000..0af07fc89cf
--- /dev/null
+++ b/tests/misc/hl/projects/Issue11689/compile.hxml
@@ -0,0 +1,2 @@
+-m Main
+-hl out/main.c
\ No newline at end of file