diff --git a/lib/CodeGen/GlobalISel/Combiner.cpp b/lib/CodeGen/GlobalISel/Combiner.cpp
index 0e17a616cfd..f1071d96e5a 100644
--- a/lib/CodeGen/GlobalISel/Combiner.cpp
+++ b/lib/CodeGen/GlobalISel/Combiner.cpp
@@ -153,8 +153,8 @@ bool Combiner::combineMachineInstrs(MachineFunction &MF,
     MFChanged |= Changed;
   } while (Changed);
 
-  assert(!CSEInfo || !errorToBool(CSEInfo->verify()) &&
+  assert(!CSEInfo || (!errorToBool(CSEInfo->verify()) &&
                          "CSEInfo is not consistent. Likely missing calls to "
-                         "observer on mutations");
+                         "observer on mutations"));
   return MFChanged;
 }