diff --git a/pkgs/applications/misc/keepassx/community.nix b/pkgs/applications/misc/keepassx/community.nix
index 6f2f31473eb..4daa1938aba 100644
--- a/pkgs/applications/misc/keepassx/community.nix
+++ b/pkgs/applications/misc/keepassx/community.nix
@@ -16,9 +16,9 @@
 , qtx11extras
 
 , withKeePassBrowser ? true
+, withKeePassSSHAgent ? true
 , withKeePassHTTP ? false
 , withKeePassNetworking ? false
-, withKeePassSSHAgent ? false
 }:
 
 with stdenv.lib;
@@ -34,6 +34,8 @@ stdenv.mkDerivation rec {
     sha256 = "1zch1qbqgphhp2p2kvjlah8s337162m69yf4y00kcnfb3539ii5f";
   };
 
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-old-style-cast";
+
   patches = [ ./darwin.patch ];
 
   cmakeFlags = [