diff --git a/pkgs/development/libraries/qt-4.5/default.nix b/pkgs/development/libraries/qt-4.5/default.nix
index 4bf262c7a87..441178a52af 100644
--- a/pkgs/development/libraries/qt-4.5/default.nix
+++ b/pkgs/development/libraries/qt-4.5/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation {
   name = "qt-4.5.3";
   
   src = fetchurl {
-    url = ftp://ftp.trolltech.com/qt/source/qt-x11-opensource-src-4.5.3.tar.bz2;
+    url = ftp://ftp.trolltech.com/qt/source/qt-x11-opensource-src-4.5.3.tar.gz;
     sha256 = "19ls11m5skcjfgrfcidwqdm72kl7qrbj4hdl1nbmcdaxh91gr1qc";
   };