diff --git a/layout/style/nsCSSParser.cpp b/layout/style/nsCSSParser.cpp
index 50140fa9cabd..c447ec2f62e9 100644
--- a/layout/style/nsCSSParser.cpp
+++ b/layout/style/nsCSSParser.cpp
@@ -814,8 +814,7 @@ CSSParserImpl::ParseStyleAttribute(const nsAString& aAttributeValue,
   // In quirks mode, allow style declarations to have braces or not
   // (bug 99554).
   PRBool haveBraces;
-  if (mNavQuirkMode) {
-    GetToken(errorCode, PR_TRUE);
+  if (mNavQuirkMode && GetToken(errorCode, PR_TRUE)) {
     haveBraces = eCSSToken_Symbol == mToken.mType &&
                  '{' == mToken.mSymbol;
     UngetToken();