diff --git a/mozilla/xpcom/obsolete/nsFileSpecUnix.cpp b/mozilla/xpcom/obsolete/nsFileSpecUnix.cpp
index 956bbcec5d2..fdf8f5d3798 100644
--- a/mozilla/xpcom/obsolete/nsFileSpecUnix.cpp
+++ b/mozilla/xpcom/obsolete/nsFileSpecUnix.cpp
@@ -406,6 +406,7 @@ nsresult nsFileSpec::Rename(const char* inNewName)
     {
         // Could not rename, set back to the original.
         mPath = oldPath;
+        nsCRT::free(oldPath);
         return NS_FILE_FAILURE;
     }