diff --git a/core/block_svg.js b/core/block_svg.js
index 9c6cb90ae..4745b8d32 100644
--- a/core/block_svg.js
+++ b/core/block_svg.js
@@ -1510,7 +1510,7 @@ Blockly.BlockSvg.prototype.setWarningText = function(text, opt_id) {
       if (!newText) {
         this.warning.dispose();
       }
-      changedState = oldText == newText;
+      changedState = oldText != newText;
     }
   }
   if (changedState && this.rendered) {