--- a/layout/style/nsCSSParser.cpp
+++ b/layout/style/nsCSSParser.cpp
@@ -2464,17 +2464,17 @@ SeparatorRequiredBetweenTokens(nsCSSToke
                  aToken1 == eCSSTokenSerialization_CDC ||
                  aToken1 == eCSSTokenSerialization_Symbol_OpenParen ||
                  aToken1 == eCSSTokenSerialization_Symbol_Question ||
                  aToken1 == eCSSTokenSerialization_Symbol_Assorted ||
                  aToken1 == eCSSTokenSerialization_Symbol_Asterisk ||
                  aToken1 == eCSSTokenSerialization_Symbol_Equals ||
                  aToken1 == eCSSTokenSerialization_Symbol_Bar ||
                  aToken1 == eCSSTokenSerialization_Symbol_Slash ||
-                 aToken1 == eCSSTokenSerialization_Other ||
+                 aToken1 == eCSSTokenSerialization_Other,
                  "unexpected nsCSSTokenSerializationType value");
       return false;
   }
 }
 
 /**
  * Appends aValue to aResult, possibly inserting an empty CSS
  * comment between the two to ensure that tokens from both strings