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diff --git a/testsuite/tests/indexed-types/should_fail/SimpleFail10.hs b/testsuite/tests/indexed-types/should_fail/SimpleFail10.hs
new file mode 100644
index 0000000000..7235f67e02
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+++ b/testsuite/tests/indexed-types/should_fail/SimpleFail10.hs
@@ -0,0 +1,13 @@
+{-# LANGUAGE TypeFamilies #-}
+
+module ShouldFail where
+
+class C8 a where
+  data S8 a :: * -> *
+
+instance C8 Int where
+  data S8 Int a = S8Int a
+
+-- must fail: extra arguments must be variables
+instance C8 Bool where
+  data S8 Bool Char = S8Bool