diff --git a/client/src/mifare/mad.c b/client/src/mifare/mad.c
index 5f50b3a4e..d0838877a 100644
--- a/client/src/mifare/mad.c
+++ b/client/src/mifare/mad.c
@@ -105,10 +105,10 @@ static int mad_print(json_t **xroot, char *mad, bool verbose, char *out) {
             elm = data;
             break;
         }
-        char low[strlen(fmad)];
-        strcpy(low, fmad);
-        str_lower(low);
-        if (strcmp(mad, low) == 0) {
+        char lmad[strlen(mad)];
+        strcpy(lmad, mad);
+        str_lower(lmad);
+        if (strcmp(lmad, fmad) == 0) {
             elm = data;
             break;
         }