diff --git a/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c b/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c
index 27cb503c23..928aca39dd 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c
+++ b/libraries/AP_HAL_ChibiOS/hwdef/common/usbcfg.c
@@ -32,7 +32,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#pragma GCC optimize("O0")
+// #pragma GCC optimize("O0")
 
 #ifdef HAL_USB_PRODUCT_ID