diff --git a/src/server.c b/src/server.c
index c1e7c33..4043c61 100644
--- a/src/server.c
+++ b/src/server.c
@@ -449,7 +449,7 @@ int main(int argc, char **argv) {
           LWS_LIBRARY_VERSION);
   info.server_string = server_hdr;
 #endif
-#if LWS_LIBRARY_VERSION_NUMBER >= 2001000
+#if LWS_LIBRARY_VERSION_NUMBER >= 2001000 && LWS_LIBRARY_VERSION_NUMBER < 4000000
   info.ws_ping_pong_interval = 5;
 #endif