diff --git a/Formula/x/x11vnc.rb b/Formula/x/x11vnc.rb
index 31d92be9578ef..d6fad78a160af 100644
--- a/Formula/x/x11vnc.rb
+++ b/Formula/x/x11vnc.rb
@@ -39,6 +39,7 @@ class X11vnc < Formula
   def install
     # Fix compile with newer Clang
     ENV.append_to_cflags "-Wno-implicit-function-declaration" if DevelopmentTools.clang_build_version >= 1403
+    ENV.append_to_cflags "-Wno-int-conversion" if DevelopmentTools.clang_build_version >= 1500
 
     ENV.prepend_path "PKG_CONFIG_PATH", Formula["openssl@3"].opt_lib/"pkgconfig"