diff --git a/pkgs/development/libraries/libpng/default.nix b/pkgs/development/libraries/libpng/default.nix
index 23d4ce8ce71..6702cdec9c1 100644
--- a/pkgs/development/libraries/libpng/default.nix
+++ b/pkgs/development/libraries/libpng/default.nix
@@ -5,8 +5,8 @@ assert zlib != null;
 let
   version = "1.6.4";
   sha256 = "15pqany43q2hzaxqn84p9dba071xmvqi8h1bhnjxnxdf3g64zayg";
-  patch_src = throw "apng patch not yet released" fetchurl {
-    url = "mirror://sourceforge/libpng-apng/libpng-${version}-apng.patch.gz";
+  patch_src = fetchurl { # not released yet, hopefully OK
+    url = "mirror://sourceforge/libpng-apng/libpng-1.6.3-apng.patch.gz";
     sha256 = "0fjnb6cgbj2c7ggl0qzcnliml2ylrjxzigp89vw0hxq221k5mlsx";
   };
   whenPatched = stdenv.lib.optionalString apngSupport;