diff --git a/mozilla/netwerk/mime/src/nsMIMEService.cpp b/mozilla/netwerk/mime/src/nsMIMEService.cpp
index c1dc37ad1e2..561f228bd18 100644
--- a/mozilla/netwerk/mime/src/nsMIMEService.cpp
+++ b/mozilla/netwerk/mime/src/nsMIMEService.cpp
@@ -249,6 +249,8 @@ nsMIMEService::GetTypeFromURI(nsIURI *aURI, char **aContentType) {
         rv = GetTypeFromExtension(ext, aContentType);
         nsAllocator::Free(ext);
     }
+    else
+        return NS_ERROR_FAILURE;
     return rv;
 }