--- a/toolkit/crashreporter/client/crashreporter_unix_common.cpp
+++ b/toolkit/crashreporter/client/crashreporter_unix_common.cpp
@@ -50,16 +50,18 @@ void UIPruneSavedDumps(const std::string
       return;
     }
 
     fd.timestamp = st.st_mtime;
 
     dumpfiles.push_back(fd);
   }
 
+  closedir(dirfd);
+
   sort(dumpfiles.begin(), dumpfiles.end(), CompareFDTime);
 
   while (dumpfiles.size() > kSaveCount) {
     // get the path of the oldest file
     string path = dumpfiles[dumpfiles.size() - 1].path;
     UIDeleteFile(path.c_str());
 
     // s/.dmp/.extra/