diff --git a/mozilla/modules/libpref/src/nsPrefService.cpp b/mozilla/modules/libpref/src/nsPrefService.cpp
index 71d035cf5f7..47ef57c5ca4 100644
--- a/mozilla/modules/libpref/src/nsPrefService.cpp
+++ b/mozilla/modules/libpref/src/nsPrefService.cpp
@@ -295,7 +295,7 @@ nsresult nsPrefService::useUserPrefFile()
   if (NS_SUCCEEDED(rv) && aFile) {
     rv = aFile->Append(userFiles[0]);
     if (NS_SUCCEEDED(rv)) {
-      rv = openPrefFile(mCurrentFile, PR_FALSE, PR_FALSE, PR_FALSE, PR_TRUE);
+      rv = openPrefFile(aFile, PR_FALSE, PR_FALSE, PR_FALSE, PR_TRUE);
     }
   }
   return rv;