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-rw-r--r--pkgs/applications/misc/xmr-stak/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/applications/misc/xmr-stak/default.nix b/pkgs/applications/misc/xmr-stak/default.nix
index d12f649d5ee4..e5a419f6a8c1 100644
--- a/pkgs/applications/misc/xmr-stak/default.nix
+++ b/pkgs/applications/misc/xmr-stak/default.nix
@@ -1,6 +1,6 @@
 { stdenv, lib, fetchFromGitHub, cmake, libuv, libmicrohttpd, openssl
 , opencl-headers, ocl-icd, hwloc, cudatoolkit
-, devDonationLevel ? 0.0
+, devDonationLevel ? "0.0"
 , cudaSupport ? false  # doesn't work currently
 }:
 
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     substituteInPlace xmrstak/donate-level.hpp \
-      --replace 'fDevDonationLevel = 2.0' 'fDevDonationLevel = ${toString devDonationLevel}'
+      --replace 'fDevDonationLevel = 2.0' 'fDevDonationLevel = ${devDonationLevel}'
   '';
 
   meta = with lib; {