diff --git a/libbindgen/src/codegen/mod.rs b/libbindgen/src/codegen/mod.rs
index 2f18036a92..be95b72648 100644
--- a/libbindgen/src/codegen/mod.rs
+++ b/libbindgen/src/codegen/mod.rs
@@ -2005,7 +2005,11 @@ impl CodeGenerator for Function {
         let signature = signature_item.kind().expect_type();
         let signature = match *signature.kind() {
             TypeKind::Function(ref sig) => sig,
-            _ => panic!("How?"),
+            TypeKind::ResolvedTypeRef(ref item_id) => {
+                let item = ctx.resolve_item(*item_id);
+                return self.codegen(ctx, result, _whitelisted_items, item);
+            },
+            _ => panic!("How?")
         };
 
         let fndecl = utils::rust_fndecl_from_signature(ctx, signature_item);
diff --git a/libbindgen/tests/expectations/tests/resolved_type_def_function.rs b/libbindgen/tests/expectations/tests/resolved_type_def_function.rs
new file mode 100644
index 0000000000..fb308fa47d
--- /dev/null
+++ b/libbindgen/tests/expectations/tests/resolved_type_def_function.rs
@@ -0,0 +1,7 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(non_snake_case)]
+
+
+pub type FuncType = ::std::option::Option<unsafe extern "C" fn()>;
diff --git a/libbindgen/tests/headers/resolved_type_def_function.h b/libbindgen/tests/headers/resolved_type_def_function.h
new file mode 100644
index 0000000000..139b8c3e85
--- /dev/null
+++ b/libbindgen/tests/headers/resolved_type_def_function.h
@@ -0,0 +1,2 @@
+typedef void (FuncType) ();
+extern FuncType Func;
\ No newline at end of file