diff --git a/tdutils/td/utils/bits.h b/tdutils/td/utils/bits.h
index 92cfd7d6..2096caef 100644
--- a/tdutils/td/utils/bits.h
+++ b/tdutils/td/utils/bits.h
@@ -98,7 +98,7 @@ inline int32 count_bits64(uint64 x) {
 
 inline int32 count_leading_zeroes32(uint32 x) {
   unsigned __int32 res = 0;
-  if (_BitScanReverse(&__int32, x)) {
+  if (_BitScanReverse(&res, x)) {
     return 31 - res;
   }
   return 32;