diff --git a/pkgs/tools/graphics/graphviz/2.0.nix b/pkgs/tools/graphics/graphviz/2.0.nix
index 0a11c3c8b28..43ad863e90a 100644
--- a/pkgs/tools/graphics/graphviz/2.0.nix
+++ b/pkgs/tools/graphics/graphviz/2.0.nix
@@ -1,5 +1,5 @@
 { stdenv, fetchurl, pkgconfig, xlibsWrapper, libpng, libjpeg, expat, libXaw
-, yacc, libtool, fontconfig, pango, gd
+, yacc, libtool, fontconfig, pango, gd, libwebp
 }:
 
 assert libpng != null && libjpeg != null && expat != null;
@@ -12,7 +12,9 @@ stdenv.mkDerivation rec {
     sha256 = "39b8e1f2ba4cc1f5bdc8e39c7be35e5f831253008e4ee2c176984f080416676c";
   };
 
-  buildInputs = [pkgconfig xlibsWrapper libpng libjpeg expat libXaw yacc libtool fontconfig pango gd];
+  buildInputs = [pkgconfig xlibsWrapper libpng libjpeg expat libXaw yacc
+    libtool fontconfig pango gd libwebp
+    ];
   
   configureFlags =
     [ "--with-pngincludedir=${libpng.dev}/include"