diff --git a/semihosting/config.c b/semihosting/config.c
index 249a377ae8..56283b5c3c 100644
--- a/semihosting/config.c
+++ b/semihosting/config.c
@@ -113,12 +113,13 @@ static int add_semihosting_arg(void *opaque,
 void semihosting_arg_fallback(const char *file, const char *cmd)
 {
     char *cmd_token;
+    g_autofree char *cmd_dup = g_strdup(cmd);
 
     /* argv[0] */
     add_semihosting_arg(&semihosting, "arg", file, NULL);
 
     /* split -append and initialize argv[1..n] */
-    cmd_token = strtok(g_strdup(cmd), " ");
+    cmd_token = strtok(cmd_dup, " ");
     while (cmd_token) {
         add_semihosting_arg(&semihosting, "arg", cmd_token, NULL);
         cmd_token = strtok(NULL, " ");