diff --git a/toolkit/xre/nsAppRunner.cpp b/toolkit/xre/nsAppRunner.cpp
index 8d891644e9c0..ad99b2e659a2 100644
--- a/toolkit/xre/nsAppRunner.cpp
+++ b/toolkit/xre/nsAppRunner.cpp
@@ -1031,7 +1031,7 @@ XRE_GetBinaryPath(const char* argv0, nsILocalFile* *aResult)
     return NS_ERROR_FAILURE;
   }
 
-  nsresult rv = lfm->InitWithFSRef(fileRef);
+  rv = lfm->InitWithFSRef(&fileRef);
   CFRelease(bundleURL);
 
   if (NS_FAILED(rv))