diff --git a/src/avrdude.h b/src/avrdude.h
index c679a654..6b777d30 100644
--- a/src/avrdude.h
+++ b/src/avrdude.h
@@ -44,6 +44,7 @@ extern const char *pgmid;    // Programmer -c string
 #define mmt_strdup(s) cfg_strdup(__func__, s)
 #define mmt_malloc(n) cfg_malloc(__func__, n)
 #define mmt_realloc(p, n) cfg_realloc(__func__, p, n)
+#define mmt_free(p) free(p)
 
 int avrdude_message2(FILE *fp, int lno, const char *file, const char *func, int msgmode, int msglvl, const char *format, ...);
 
diff --git a/src/wiring.c b/src/wiring.c
index 6c62354d..a24e6bc2 100644
--- a/src/wiring.c
+++ b/src/wiring.c
@@ -69,11 +69,11 @@ static void wiring_setup(PROGRAMMER *pgm) {
   stk500v2_setup(pgm);
 
   // Then prepare our data and store in a safe place for the time being
-  ((struct pdata *)(pgm->cookie))->chained_pdata = cfg_malloc(__func__, sizeof(struct wiringpdata));
+  ((struct pdata *)(pgm->cookie))->chained_pdata = mmt_malloc(sizeof(struct wiringpdata));
 }
 
 static void wiring_teardown(PROGRAMMER *pgm) {
-  free(((struct pdata *)(pgm->cookie))->chained_pdata);
+  mmt_free(((struct pdata *)(pgm->cookie))->chained_pdata);
   stk500v2_teardown(pgm);
 }