diff --git a/src/stk500v2.c b/src/stk500v2.c
index 40727cd7..b923666c 100644
--- a/src/stk500v2.c
+++ b/src/stk500v2.c
@@ -564,7 +564,7 @@ static int stk500v2_jtagmkII_recv(const PROGRAMMER *pgm, unsigned char *msg,
     return -1;
   }
   memcpy(msg, jtagmsg + 1, rv - 1);
-  free(jtagmsg);                // Sic! jtagmsg was malloc'd
+  mmt_free(jtagmsg);
   return rv;
 }