diff --git a/pkgs/tools/networking/kea/default.nix b/pkgs/tools/networking/kea/default.nix
index e1829bcaf7d..cd4c4512169 100644
--- a/pkgs/tools/networking/kea/default.nix
+++ b/pkgs/tools/networking/kea/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   configureFlags = [
     "--localstatedir=/var"
     "--with-botan-config=${botan}/bin/botan-config-1.10"
-    "--with-dhcp-pgsql=${postgresql}/bin/pg_config"
+    "--with-dhcp-pgsql=${postgresql.dev}/bin/pg_config"
     "--with-dhcp-mysql=${mysql.client.dev}/bin/mysql_config"
   ];