--- a/xpcom/base/nsTraceRefcnt.cpp
+++ b/xpcom/base/nsTraceRefcnt.cpp
@@ -230,17 +230,17 @@ public:
 private:
   typedef nsTHashtable<nsCharPtrHashKey> StringSet;
   StringSet mSet;
 };
 
 struct CodeAddressServiceStringAlloc MOZ_FINAL
 {
   static char* copy(const char* aStr) { return strdup(aStr); }
-  static void free(char* aPtr) { free(aPtr); }
+  static void free(char* aPtr) { ::free(aPtr); }
 };
 
 class CodeAddressServiceWriter MOZ_FINAL
 {
 public:
   explicit CodeAddressServiceWriter(FILE* aFile)
     : mFile(aFile)
   {