diff --git a/content/svg/content/src/nsSVGBoolean.cpp b/content/svg/content/src/nsSVGBoolean.cpp
index 7185312d79fc..79d07fbfe2db 100644
--- a/content/svg/content/src/nsSVGBoolean.cpp
+++ b/content/svg/content/src/nsSVGBoolean.cpp
@@ -75,13 +75,12 @@ nsSVGBoolean::GetBaseValueString(nsAString & aValueAsString)
 
 void
 nsSVGBoolean::SetBaseValue(PRBool aValue,
-                           nsSVGElement *aSVGElement,
-                           PRBool aDoSetAttr)
+                           nsSVGElement *aSVGElement)
 {
   NS_PRECONDITION(aValue == PR_TRUE || aValue == PR_FALSE, "Boolean out of range");
 
   mAnimVal = mBaseVal = aValue;
-  aSVGElement->DidChangeBoolean(mAttrEnum, aDoSetAttr);
+  aSVGElement->DidChangeBoolean(mAttrEnum, PR_TRUE);
 }
 
 nsresult
diff --git a/content/svg/content/src/nsSVGBoolean.h b/content/svg/content/src/nsSVGBoolean.h
index 363961b68d3f..4de8350738b0 100644
--- a/content/svg/content/src/nsSVGBoolean.h
+++ b/content/svg/content/src/nsSVGBoolean.h
@@ -55,7 +55,7 @@ public:
                               PRBool aDoSetAttr);
   void GetBaseValueString(nsAString& aValue);
 
-  void SetBaseValue(PRBool aValue, nsSVGElement *aSVGElement, PRBool aDoSetAttr);
+  void SetBaseValue(PRBool aValue, nsSVGElement *aSVGElement);
   PRBool GetBaseValue() const
     { return mBaseVal; }
   PRBool GetAnimValue() const
@@ -83,7 +83,7 @@ private:
     NS_IMETHOD GetBaseVal(PRBool* aResult)
       { *aResult = mVal->GetBaseValue(); return NS_OK; }
     NS_IMETHOD SetBaseVal(PRBool aValue)
-      { mVal->SetBaseValue(aValue, mSVGElement, PR_TRUE); return NS_OK; }
+      { mVal->SetBaseValue(aValue, mSVGElement); return NS_OK; }
     NS_IMETHOD GetAnimVal(PRBool* aResult)
       { *aResult = mVal->GetAnimValue(); return NS_OK; }