diff --git a/src/common/tusb_fifo.h b/src/common/tusb_fifo.h
index eb88538ef..e56bcb844 100644
--- a/src/common/tusb_fifo.h
+++ b/src/common/tusb_fifo.h
@@ -47,6 +47,7 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include "osal/osal.h"
 
 #ifdef __cplusplus
 extern "C" {