diff --git a/src/libCom/freeList/freeListLib.c b/src/libCom/freeList/freeListLib.c
index 749cc1940..32ac99fdd 100644
--- a/src/libCom/freeList/freeListLib.c
+++ b/src/libCom/freeList/freeListLib.c
@@ -170,6 +170,7 @@ epicsShareFunc void epicsShareAPI freeListCleanup(void *pvt)
 	free(phead);
 	phead = pnext;
     }
+    semMutexDestroy(pfl->lock);
     free(pvt);
 }