diff --git a/modules/libjar/nsZipArchive.cpp b/modules/libjar/nsZipArchive.cpp
index f656cdb5d90b..0f5afdc6989b 100644
--- a/modules/libjar/nsZipArchive.cpp
+++ b/modules/libjar/nsZipArchive.cpp
@@ -696,7 +696,8 @@ nsZipArchive::FindInit(const char * aPattern, nsZipFind **aFind)
 
   // Create synthetic directory entries on demand
   nsresult rv = BuildSynthetics();
-  if (NS_FAILED(rv)) return rv;
+  // XXX NS_FAILED doesn't exist when building STANDALONE
+  if (rv & 0x80000000) return rv;
 
   // validate the pattern
   if (aPattern)