diff --git a/cmProc4.c b/cmProc4.c
index 9a7e35e..a7d0cba 100644
--- a/cmProc4.c
+++ b/cmProc4.c
@@ -4530,6 +4530,7 @@ cmRC_t cmGoertzelFree( cmGoertzel** pp )
 
   cmShiftBufFree(&p->shb);
   cmMemFree(p->ch);
+  cmMemFree(p->wnd);
   cmObjFree(pp);
   return rc;