diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index f0ebdf0096c..fb1cd63a4dc 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -51,7 +51,7 @@ let
       "--with-libmemcached-dir=${pkgs.libmemcached}"
     ];
 
-    buildInputs = with pkgs; [ pkgconfig cyrus_sasl ];
+    buildInputs = with pkgs; [ pkgconfig cyrus_sasl zlib ];
   };
 
   # Not released yet
@@ -69,7 +69,7 @@ let
       "--with-libmemcached-dir=${pkgs.libmemcached}"
     ];
 
-    buildInputs = with pkgs; [ pkgconfig cyrus_sasl ];
+    buildInputs = with pkgs; [ pkgconfig cyrus_sasl zlib ];
   };
 
   # No support for PHP 7 yet (and probably never will be)