diff --git a/src/libCom/gpHash/gpHashLib.c b/src/libCom/gpHash/gpHashLib.c
index 9e1487d59..51db1bb3e 100644
--- a/src/libCom/gpHash/gpHashLib.c
+++ b/src/libCom/gpHash/gpHashLib.c
@@ -226,6 +226,7 @@ void epicsShareAPI gphFreeMem(void *pvt)
 	}
 	free((void *)paplist[hashInd]);
     }
+    epicsMutexDestroy(pgphPvt->lock);
     free((void *)paplist);
     free((void *)pgphPvt);
 }