diff --git a/Source/WebCore/html/FormController.cpp b/Source/WebCore/html/FormController.cpp
index b7c38e2..94107a6 100644
--- a/Source/WebCore/html/FormController.cpp
+++ b/Source/WebCore/html/FormController.cpp
@@ -172,6 +172,9 @@
         stateVector.append(keyGenerator->formKey(*elementWithState).string());
         elementWithState->saveFormControlState().serializeTo(stateVector);
     }
+    bool hasOnlySignature = stateVector.size() == 1;
+    if (hasOnlySignature)
+        stateVector.clear();
     return stateVector;
 }