diff --git a/src/libguac/client.c b/src/libguac/client.c
index 55efa48c..5e23a408 100644
--- a/src/libguac/client.c
+++ b/src/libguac/client.c
@@ -482,6 +482,7 @@ void guac_client_free(guac_client* client) {
     }
 
     pthread_rwlock_destroy(&(client->__users_lock));
+    free(client->connection_id);
     free(client);
 }