diff --git a/src/PlatformSockets.c b/src/PlatformSockets.c
index 9d34084..56f9b9c 100644
--- a/src/PlatformSockets.c
+++ b/src/PlatformSockets.c
@@ -624,7 +624,7 @@ static bool isPrivateNetworkAddressV4(struct sockaddr_in* address, bool matchCGN
         return true;
     }
     // 100.64.0.0/10
-    else if (matchCGN && (addr & 0xFFFC0000) == 0x64400000) {
+    else if (matchCGN && (addr & 0xFFC00000) == 0x64400000) {
         return true;
     }
     else {