diff --git a/src/portable/st/stm32_fsdev/fsdev_common.c b/src/portable/st/stm32_fsdev/fsdev_common.c
index def3b2c2e..9c9233d12 100644
--- a/src/portable/st/stm32_fsdev/fsdev_common.c
+++ b/src/portable/st/stm32_fsdev/fsdev_common.c
@@ -36,7 +36,7 @@ void fsdev_core_reset(void) {
 
   #if (CFG_TUSB_MCU == OPT_MCU_AT32F403A_407) || (CFG_TUSB_MCU == OPT_MCU_AT32F413)
   // Enable larger PMA area
-  CRM->misc1_bit.usbbufs = TRUE;
+  CRM->misc1_bit.usbbufs = 1;
   #endif
 }