diff --git a/qemu-io.c b/qemu-io.c
index 2bd7bfb..050c708 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -475,10 +475,10 @@
     return last_error;
 }
 
-static void add_user_command(char *optarg)
+static void add_user_command(char *user_cmd)
 {
     cmdline = g_renew(char *, cmdline, ++ncmdline);
-    cmdline[ncmdline-1] = optarg;
+    cmdline[ncmdline - 1] = user_cmd;
 }
 
 static void reenable_tty_echo(void)