diff --git a/mozilla/netwerk/util/src/nsNetStreamLoader.cpp b/mozilla/netwerk/util/src/nsNetStreamLoader.cpp
index f0a0a79c2f5..a522039fe53 100644
--- a/mozilla/netwerk/util/src/nsNetStreamLoader.cpp
+++ b/mozilla/netwerk/util/src/nsNetStreamLoader.cpp
@@ -183,7 +183,7 @@ nsUnicharStreamLoader::OnDataAvailable(nsIChannel* channel, nsISupports *ctxt,
   return rv;
 }
 
-extern nsresult 
+extern PR_PUBLIC_API(nsresult)
 NS_NewUnicharStreamLoader(nsIUnicharStreamLoader** aInstancePtrResult,
                           nsIURI* aURL,
                           nsILoadGroup* aLoadGroup,