diff --git a/pkgs/applications/networking/p2p/mldonkey/default.nix b/pkgs/applications/networking/p2p/mldonkey/default.nix
index b9cba535c37a..d32465afcf4a 100644
--- a/pkgs/applications/networking/p2p/mldonkey/default.nix
+++ b/pkgs/applications/networking/p2p/mldonkey/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
   '';
 
   env = {
-    NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration";
+    NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=incompatible-pointer-types -DPROTOTYPES=1";
   }
   # https://github.com/ygrek/mldonkey/issues/117
   // lib.optionalAttrs stdenv.cc.isClang {