diff --git a/pkgs/by-name/li/libpng/12.nix b/pkgs/by-name/li/libpng12/package.nix
similarity index 93%
rename from pkgs/by-name/li/libpng/12.nix
rename to pkgs/by-name/li/libpng12/package.nix
index 3ab92139ab9e..62ffbf0cbdcb 100644
--- a/pkgs/by-name/li/libpng/12.nix
+++ b/pkgs/by-name/li/libpng12/package.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   src = fetchurl {
     url = "mirror://sourceforge/libpng/libpng-${finalAttrs.version}.tar.xz";
-    sha256 = "1izw9ybm27llk8531w6h4jp4rk2rxy2s9vil16nwik5dp0amyqxl";
+    hash = "sha256-tGNfFbitzMitCTTupIXvWcxMriTQ8DAKmpQeUZdP/Mc=";
   };
 
   postPatch = lib.optionalString stdenv.hostPlatform.isDarwin ''
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4b7faaff7894..6ee1eb2c3301 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7151,8 +7151,6 @@ with pkgs;
   libpeas = callPackage ../development/libraries/libpeas { };
   libpeas2 = callPackage ../development/libraries/libpeas/2.x.nix { };
 
-  libpng12 = callPackage ../development/libraries/libpng/12.nix { };
-
   inherit
     (callPackages ../development/libraries/prometheus-client-c {
       stdenv = gccStdenv; # Required for darwin