diff --git a/test/CFrontend/2004-06-08-OpaqueStructArg.c b/test/CFrontend/2004-06-08-OpaqueStructArg.c
new file mode 100644
index 00000000000..c73bc861263
--- /dev/null
+++ b/test/CFrontend/2004-06-08-OpaqueStructArg.c
@@ -0,0 +1,5 @@
+   struct fu;
+   void foo(struct fu);
+   void bar() {
+      foo;
+   }