diff --git a/server.js b/server.js
index 0d90aeb68861ed91eb2194b796383dffbaa5bc10..709c1dc60708fd00afcffc1aa3830eab3eca98f5 100755
--- a/server.js
+++ b/server.js
@@ -39,7 +39,7 @@ function getLockInstance( lockName ) {
     if ( lock ) {
         return lock;
     } else {
-        clearCaches( req.params.lock_name );
+        clearCaches( lockName );
         res.sendStatus( 400 );
         return false;
     }