diff --git a/drivers/firmware/qemu_fw_cfg.c b/drivers/firmware/qemu_fw_cfg.c
index fedbff55a7f3848872b7d0196086bc0f56caa0c7..7bba76c0206cb78ccf54784583d1dd79bd0615cf 100644
--- a/drivers/firmware/qemu_fw_cfg.c
+++ b/drivers/firmware/qemu_fw_cfg.c
@@ -109,9 +109,7 @@ static void fw_cfg_io_cleanup(void)
 #  define FW_CFG_CTRL_OFF 0x00
 #  define FW_CFG_DATA_OFF 0x01
 # else
-#  warning "QEMU FW_CFG may not be available on this architecture!"
-#  define FW_CFG_CTRL_OFF 0x00
-#  define FW_CFG_DATA_OFF 0x01
+#  error "QEMU FW_CFG not available on this architecture!"
 # endif
 #endif