diff --git a/similar/main/net_udp.cpp b/similar/main/net_udp.cpp
index 7a50abd20..f6e1f43f6 100644
--- a/similar/main/net_udp.cpp
+++ b/similar/main/net_udp.cpp
@@ -155,9 +155,9 @@ struct RAIIsocket
 {
 #ifndef _WIN32
 	typedef int SOCKET;
-	int closesocket(SOCKET s)
+	int closesocket(SOCKET fd)
 	{
-		return close(s);
+		return close(fd);
 	}
 #endif
 	SOCKET s;