diff --git a/src/external/sinfl.h b/src/external/sinfl.h
index 3c7173777..af730c1d2 100644
--- a/src/external/sinfl.h
+++ b/src/external/sinfl.h
@@ -174,7 +174,7 @@ sinfl_bsr(unsigned n) {
 #if defined(_MSC_VER) && !defined(__clang__)
   _BitScanReverse(&n, n);
   return n;
-#elif defined(__GNUC__) || defined(__clang__)
+#else // defined(__GNUC__) || defined(__clang__) || defined(__TINYC__)
   return 31 - __builtin_clz(n);
 #endif
 }