diff --git a/utils/llvm.grm b/utils/llvm.grm
index d391e2aeab9..fa0dcd1e152 100644
--- a/utils/llvm.grm
+++ b/utils/llvm.grm
@@ -398,7 +398,7 @@ OptVolatile ::= - volatile | _ ;
 OptExact ::= - exact | _ ;
 OptNSW ::= - nsw | _ ;
 OptNUW ::= - nuw | _ ;
-OptNW  ::= OptNUW OptNSW ;
+OptNW  ::= OptNUW OptNSW | OptNSW OptNUW ;
 OptInBounds  ::= - inbounds | _ ;
 
 MemoryInst ::= malloc Types OptCAlign