diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index ff37d2504e0..4d9906b073b 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -9757,7 +9757,7 @@ nsCSSFrameConstructor::CreateNeededTablePseudos(nsFrameConstructorState& aState,
           eTypeColGroup : eTypeRowGroup;
         break;
       default:
-        NS_NOTREACHED("Colgroups should be suppresing non-col child items");
+        MOZ_NOT_REACHED("Colgroups should be suppresing non-col child items");
         break;
     }