diff --git a/src/common/tusb_mcu.h b/src/common/tusb_mcu.h
index b647b2a7f..1c11df114 100644
--- a/src/common/tusb_mcu.h
+++ b/src/common/tusb_mcu.h
@@ -442,7 +442,7 @@
   #define TUP_DCD_ENDPOINT_MAX    16
   #define TUP_MCU_MULTIPLE_CORE   1
 
-  #define TU_ATTR_FAST_FUNC       __attribute__((section(".time_critical.tinyusb")))
+  #define TU_ATTR_FAST_FUNC       __not_in_flash("tinyusb")
 
 //--------------------------------------------------------------------+
 // Silabs