diff --git a/pkgs/tools/graphics/pngcheck/default.nix b/pkgs/tools/graphics/pngcheck/default.nix
index a4680dff6f64..cb415a2c53ef 100644
--- a/pkgs/tools/graphics/pngcheck/default.nix
+++ b/pkgs/tools/graphics/pngcheck/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     homepage = "http://pmt.sourceforge.net/pngcrush";
     description = "Verifies the integrity of PNG, JNG and MNG files";
     license = licenses.free;
-    platforms = with platforms; [ unix ];
+    platforms = platforms.unix;
     maintainers = with maintainers; [ starcraft66 ];
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6508396af730..7f596c047184 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9060,11 +9060,7 @@ with pkgs;
 
   pm2 = nodePackages.pm2;
 
-  pngcheck = callPackage ../tools/graphics/pngcheck {
-    zlib = zlib.override {
-      static = true;
-    };
-  };
+  pngcheck = callPackage ../tools/graphics/pngcheck { };
 
   pngcrush = callPackage ../tools/graphics/pngcrush { };