diff --git a/pkgs/development/interpreters/php/default.nix b/pkgs/development/interpreters/php/default.nix
index ed018a94227..7b832fa6eed 100644
--- a/pkgs/development/interpreters/php/default.nix
+++ b/pkgs/development/interpreters/php/default.nix
@@ -99,12 +99,12 @@ let
         };
 
         postgresql = {
-          configureFlags = ["--with-pgsql=${postgresql}"];
+          configureFlags = ["--with-pgsql=${postgresql.dev}"];
           buildInputs = [ postgresql ];
         };
 
         pdo_pgsql = {
-          configureFlags = ["--with-pdo-pgsql=${postgresql}"];
+          configureFlags = ["--with-pdo-pgsql=${postgresql.dev}"];
           buildInputs = [ postgresql ];
         };