--- a/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
+++ b/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
@@ -76,16 +76,17 @@ AddMesaSysfsPaths(SandboxBroker::Policy*
             if (realSysPath) {
               nsPrintfCString ueventPath("%s/uevent", realSysPath.get());
               aPolicy->AddPath(rdonly, ueventPath.get());
             }
           }
         }
       }
     }
+    closedir(dir);
   }
 }
 
 SandboxBrokerPolicyFactory::SandboxBrokerPolicyFactory()
 {
   // Policy entries that are the same in every process go here, and
   // are cached over the lifetime of the factory.
 #if defined(MOZ_CONTENT_SANDBOX)