diff --git a/package.nix b/package.nix
index 13aec17..989758c 100644
--- a/package.nix
+++ b/package.nix
@@ -3,6 +3,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  debug ? false,
   pname ? "softether",
   logDir ? "/var/log/${pname}",
   pidDir ? "/run/${pname}",
@@ -41,7 +42,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   cmakeFlags = [
     "-DSE_PIDDIR=${pidDir}" "-DSE_LOGDIR=${logDir}" "-DSE_DBDIR=${dbDir}" "-DCMAKE_INSTALL_SYSTEMD_UNITDIR="
-    "-DCMAKE_BUILD_TYPE=Debug"
+    (lib.optionalString debug "-DCMAKE_BUILD_TYPE=Debug")
     "-DCMAKE_INSTALL_PREFIX=${placeholder "out"}"
     "-DCMAKE_INSTALL_LIBDIR=lib"
     "-DCMAKE_INSTALL_INCLUDEDIR=include"