diff --git a/docs/patterns/circuit-breaker.md b/docs/patterns/circuit-breaker.md
index 583324a5b90..90e27026a5e 100644
--- a/docs/patterns/circuit-breaker.md
+++ b/docs/patterns/circuit-breaker.md
@@ -209,7 +209,7 @@ Additionally, it uses a lock to prevent the circuit breaker from trying to perfo
         bool lockTaken = false;
         try
         {
-          Monitor.TryEnter(halfOpenSyncObject, ref lockTaken)
+          Monitor.TryEnter(halfOpenSyncObject, ref lockTaken);
           if (lockTaken)
           {
             // Set the circuit breaker state to HalfOpen.