diff --git a/pkgs/tools/networking/dnscrypt-proxy/default.nix b/pkgs/tools/networking/dnscrypt-proxy/default.nix
index 23f081c8be35..985344616e92 100644
--- a/pkgs/tools/networking/dnscrypt-proxy/default.nix
+++ b/pkgs/tools/networking/dnscrypt-proxy/default.nix
@@ -11,9 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "16lif3qhyfjpgg54vjlwpslxk90akmbhlpnn1szxm628bmpw6nl9";
   };
 
-  configureFlags = ''
-    ${optionalString stdenv.isLinux "--with-systemd"}
-  '';
+  configureFlags = optional stdenv.isLinux "--with-systemd";
 
   nativeBuildInputs = [ pkgconfig ];