diff --git a/pkgs/applications/networking/msmtp/default.nix b/pkgs/applications/networking/msmtp/default.nix
index a9c828a3fb1..34b6116df78 100644
--- a/pkgs/applications/networking/msmtp/default.nix
+++ b/pkgs/applications/networking/msmtp/default.nix
@@ -28,7 +28,7 @@ in stdenv.mkDerivation rec {
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
 
   configureFlags =
-    stdenv.lib.optional stdenv.isDarwin [ "--with-macosx-keyring" ];
+    [ "--sysconfdir=/etc" ] ++ stdenv.lib.optional stdenv.isDarwin [ "--with-macosx-keyring" ];
 
   postInstall = ''
     install -d $out/share/doc/${pname}/scripts