--- a/arch/mips/rb532/prom.c
+++ b/arch/mips/rb532/prom.c
@@ -73,7 +73,7 @@ void __init prom_setup_cmdline(void)
 	static char cmd_line[CL_SIZE] __initdata;
 	char *cp, *board;
 	int prom_argc;
-	char **prom_argv, **prom_envp;
+	char **prom_argv, **prom_envp __maybe_unused;
 	int i;
 
 	prom_argc = fw_arg0;
