diff --git a/pkgs/development/libraries/qt-3/default.nix b/pkgs/development/libraries/qt-3/default.nix
index b3dfc021da9..9b5cb0452d6 100644
--- a/pkgs/development/libraries/qt-3/default.nix
+++ b/pkgs/development/libraries/qt-3/default.nix
@@ -10,8 +10,6 @@
 , x11, xextproto, zlib, libjpeg, libpng, which
 }:
 
-let libpng = libpng; in
-
 assert xftSupport -> libXft != null;
 assert xrenderSupport -> xftSupport && libXrender != null;
 assert xrandrSupport -> libXrandr != null && randrproto != null;