diff --git a/pkgs/development/libraries/bullet/default.nix b/pkgs/development/libraries/bullet/default.nix
index f6041802a9c..1b6c56f13af 100644
--- a/pkgs/development/libraries/bullet/default.nix
+++ b/pkgs/development/libraries/bullet/default.nix
@@ -40,7 +40,8 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-error=argument-outside-range";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang
+    "-Wno-error=argument-outside-range -Wno-error=c++11-narrowing";
 
   meta = with stdenv.lib; {
     description = "A professional free 3D Game Multiphysics Library";