diff --git a/common/usb_util.h b/common/usb_util.h
index d21a5f61..7c70c1f1 100644
--- a/common/usb_util.h
+++ b/common/usb_util.h
@@ -227,6 +227,27 @@
 #define WBVAL(x) (x & 0xFF), ((x >> 8) & 0xFF)
 #define DBVAL(x) (x & 0xFF), ((x >> 8) & 0xFF), ((x >> 16) & 0xFF), ((x >> 24) & 0xFF)
 
+#define PP_NARG(...) \
+    PP_NARG_(__VA_ARGS__, PP_RSEQ_N())
+#define PP_NARG_(...) \
+    PP_ARG_N(__VA_ARGS__)
+#define PP_ARG_N(                                     \
+    _1, _2, _3, _4, _5, _6, _7, _8, _9, _10,          \
+    _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, \
+    _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, \
+    _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, \
+    _41, _42, _43, _44, _45, _46, _47, _48, _49, _50, \
+    _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, \
+    _61, _62, _63, N, ...) N
+#define PP_RSEQ_N()                             \
+    63, 62, 61, 60,                             \
+        59, 58, 57, 56, 55, 54, 53, 52, 51, 50, \
+        49, 48, 47, 46, 45, 44, 43, 42, 41, 40, \
+        39, 38, 37, 36, 35, 34, 33, 32, 31, 30, \
+        29, 28, 27, 26, 25, 24, 23, 22, 21, 20, \
+        19, 18, 17, 16, 15, 14, 13, 12, 11, 10, \
+        9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+
 #define USB_DESC_SECTION __attribute__((section("usb_desc"))) __USED __ALIGNED(1)
 
 /* DEBUG level */