diff --git a/src/descrambler/capmt.c b/src/descrambler/capmt.c
index 897b614c..382223f1 100644
--- a/src/descrambler/capmt.c
+++ b/src/descrambler/capmt.c
@@ -1775,6 +1775,7 @@ capmt_destroy(capmt_t *capmt)
   TAILQ_REMOVE(&capmts, capmt, capmt_link);  
   capmt->capmt_running = 0;
   pthread_cond_signal(&capmt->capmt_cond);
+  pthread_mutex_unlock(&global_lock);
   pthread_join(capmt->capmt_tid, NULL);
   free(capmt->capmt_sockfile);
   capmt->capmt_sockfile = NULL;
@@ -1784,6 +1785,7 @@ capmt_destroy(capmt_t *capmt)
          capmt->capmt_oscam,
          capmt->capmt_oscam == CAPMT_OSCAM_TCP ? "IP address" : "sockfile",
          capmt->capmt_sockfile, capmt->capmt_port);
+  pthread_mutex_lock(&global_lock);
 }
 
 /**