diff --git a/cdrom.c b/cdrom.c
index fccad57..02dc1d1 100644
--- a/cdrom.c
+++ b/cdrom.c
@@ -42,8 +42,7 @@ extern char version[];
 static int mount_that_cd_device(char * dev_name)
 {
 	char device_fullname[64] = "/dev/";
-	strcpy(device_fullname + 5, dev_name);
-	size_t l = strlen(device_fullname);
+	size_t l = strlen(strcpy(device_fullname + 5, dev_name));
 
 	if (islower(device_fullname[l - 1])) {
 		int ret;