diff --git a/ghc/compiler/coreSyn/CoreUnfold.lhs b/ghc/compiler/coreSyn/CoreUnfold.lhs
index c1650621c9a6385f9b1699201f9f46943341223a..e66b2e9ab17c23e4091fedf68586e92b9a51f06e 100644
--- a/ghc/compiler/coreSyn/CoreUnfold.lhs
+++ b/ghc/compiler/coreSyn/CoreUnfold.lhs
@@ -594,7 +594,7 @@ okToUnfoldInHiFile e = opt_UnfoldCasms || go e
 	      BindDefault _ rhs -> rhs:ls
 
     -- ok to unfold a PrimOp as long as it's not a _casm_
-    okToUnfoldPrimOp (CCallOp _ is_casm _ _ _ _) = not is_casm
-    okToUnfoldPrimOp _                           = True
+    okToUnfoldPrimOp (CCallOp _ is_casm _ _ _) = not is_casm
+    okToUnfoldPrimOp _                         = True
      
 \end{code}