diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c6338629d34..d77e1fd849f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3944,7 +3944,7 @@ let
   libpcap = callPackage ../development/libraries/libpcap { };
 
   libpng = callPackage ../development/libraries/libpng { };
-  libpng12 = callPackage ../development/libraries/libpng/1.2.44 { };
+  libpng12 = callPackage ../development/libraries/libpng/1.2.44.nix { };
   libpng_apng = callPackage ../development/libraries/libpng/libpng-apng.nix { };
 
   libproxy = callPackage ../development/libraries/libproxy { };