diff --git a/tools/env/fw_env_main.c b/tools/env/fw_env_main.c
index d93a915fd1..fb4afa5ee9 100644
--- a/tools/env/fw_env_main.c
+++ b/tools/env/fw_env_main.c
@@ -239,7 +239,7 @@ int main(int argc, char *argv[])
 	argv += optind;
 
 	if (env_opts.lockname) {
-		lockname = malloc(sizeof(env_opts.lockname) +
+		lockname = malloc(strlen(env_opts.lockname) +
 				sizeof(CMD_PRINTENV) + 10);
 		if (!lockname) {
 			fprintf(stderr, "Unable allocate memory");