diff --git a/client/proxmark3.c b/client/proxmark3.c
index a7cbcfe5..76909dac 100644
--- a/client/proxmark3.c
+++ b/client/proxmark3.c
@@ -146,7 +146,7 @@ void main_loop(char *script_cmds_file, char *script_cmd, bool usb_present) {
 			// If there is a script command
 			if (execCommand){
 				if ((cmd = (char*) malloc(strlen(script_cmd) + 1)) != NULL) {
-					memset(cmd, 0, strlen(script_cmd));
+					memset(cmd, 0, strlen(script_cmd) + 1);
 					strcpy(cmd, script_cmd);
 					printf(PROXPROMPT"%s\n", cmd);
 				}