diff --git a/js/src/jit/IonBuilder.cpp b/js/src/jit/IonBuilder.cpp
index 7721ed99d5..a6dcdf001a 100644
--- a/js/src/jit/IonBuilder.cpp
+++ b/js/src/jit/IonBuilder.cpp
@@ -4443,7 +4443,7 @@ IonBuilder::jsop_logical(JSOp op)
         MIsNullOrUndefined* isNullOrUndefined =
             MIsNullOrUndefined::New(alloc(), lhs);
         current->add(isNullOrUndefined);
-        test = newTest(isNullOrUndefined, evalLhs, evalRhs);
+        test = newTest(isNullOrUndefined, evalRhs, evalLhs);
         break;
       }