diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h
index 0d64271199c..d10e63c66b7 100644
--- a/include/llvm/Target/TargetLowering.h
+++ b/include/llvm/Target/TargetLowering.h
@@ -368,6 +368,7 @@ protected:
                           LegalizeAction Action) {
     assert(VT < 32 && Op < sizeof(OpActions)/sizeof(OpActions[0]) &&
            "Table isn't big enough!");
+    OpActions[Op] &= ~(3ULL << VT*2);
     OpActions[Op] |= Action << VT*2;
   }