diff --git a/lib/ngtcp2_ringbuf.c b/lib/ngtcp2_ringbuf.c
index c381c23..73d9230 100644
--- a/lib/ngtcp2_ringbuf.c
+++ b/lib/ngtcp2_ringbuf.c
@@ -32,7 +32,7 @@
 #include "ngtcp2_macro.h"
 
 #if defined(_MSC_VER) && !defined(__clang__) &&                                \
-    (defined(_M_ARM) || defined(_M_ARM64))
+    (defined(_M_ARM) || (defined(_M_ARM64) && _MSC_VER < 1941))
 static unsigned int __popcnt(unsigned int x) {
   unsigned int c = 0;
   for (; x; ++c) {