diff --git a/src/tusb_option.h b/src/tusb_option.h
index 29fdcb0d6..98f1a91b5 100644
--- a/src/tusb_option.h
+++ b/src/tusb_option.h
@@ -35,7 +35,7 @@
 #define TUSB_VERSION_REVISION  0
 
 #define TUSB_VERSION_NUMBER    (TUSB_VERSION_MAJOR * 10000 + TUSB_VERSION_MINOR * 100 + TUSB_VERSION_REVISION)
-#define TUSB_VERSION_STRING    TU_STRING(TUSB_VERSION_MAJOR) "." TU_STRING(TUSB_VERSION_MINOR) "." TU_STRING(TUSB_VERSION_REVISION)
+#define TUSB_VERSION_STRING    TU_XSTRING(TUSB_VERSION_MAJOR) "." TU_XSTRING(TUSB_VERSION_MINOR) "." TU_XSTRING(TUSB_VERSION_REVISION)
 
 //--------------------------------------------------------------------+
 // Supported MCUs