diff --git a/pkgs/development/libraries/wxGTK-2.8/default.nix b/pkgs/development/libraries/wxGTK-2.8/default.nix
index c4530da5453..6b9aa458735 100644
--- a/pkgs/development/libraries/wxGTK-2.8/default.nix
+++ b/pkgs/development/libraries/wxGTK-2.8/default.nix
@@ -41,7 +41,7 @@ stdenv.mkDerivation rec {
     + optionalString withMesa "${mesa.out}/lib ";
 
   # Work around a bug in configure.
-  NIX_CFLAGS_COMPILE = [ "-DHAVE_X11_XLIB_H=1" "-lX11" "-lcairo" ];
+  NIX_CFLAGS_COMPILE = [ "-DHAVE_X11_XLIB_H=1" "-lX11" "-lcairo" "-Wno-narrowing" ];
 
   preConfigure = "
     substituteInPlace configure --replace 'SEARCH_INCLUDE=' 'DUMMY_SEARCH_INCLUDE='