diff --git a/tests/18_err-no-type-arg.test b/tests/18_err-no-type-arg.test
new file mode 100644
index 0000000..ea6ea37
--- /dev/null
+++ b/tests/18_err-no-type-arg.test
@@ -0,0 +1,3 @@
+int main(a) {
+    return a;
+}