--- a/startupcache/StartupCache.cpp
+++ b/startupcache/StartupCache.cpp
@@ -234,25 +234,27 @@ StartupCache::GetBuffer(const char* id, 
     nsZipItemPtr<char> zipItem(mArchive, id, true);
     if (zipItem) {
       *outbuf = zipItem.Forget();
       *length = zipItem.Length();
       return NS_OK;
     } 
   }
 
+#ifdef MOZ_OMNIJAR
   if (mozilla::OmnijarReader()) {
     // no need to checksum omnijarred entries
     nsZipItemPtr<char> zipItem(mozilla::OmnijarReader(), id);
     if (zipItem) {
       *outbuf = zipItem.Forget();
       *length = zipItem.Length();
       return NS_OK;
     } 
   }
+#endif
   return NS_ERROR_NOT_AVAILABLE;
 }
 
 // Makes a copy of the buffer, client retains ownership of inbuf.
 nsresult
 StartupCache::PutBuffer(const char* id, const char* inbuf, PRUint32 len) 
 {
   if (StartupCache::gShutdownInitiated) {