diff --git a/pkgs/os-specific/linux/evdi/default.nix b/pkgs/os-specific/linux/evdi/default.nix
index efb6dd966ec1..4baba4c5f7d8 100644
--- a/pkgs/os-specific/linux/evdi/default.nix
+++ b/pkgs/os-specific/linux/evdi/default.nix
@@ -26,12 +26,17 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-xB3AHg9t/X8vw5p7ohFQ+WuMjb1P8DAP3pROiwWkVPs=";
   };
 
-  env.NIX_CFLAGS_COMPILE = toString [
+  env.CFLAGS = toString [
     "-Wno-error"
     "-Wno-error=discarded-qualifiers" # for Linux 4.19 compatibility
     "-Wno-error=sign-compare"
   ];
 
+  postBuild = ''
+    # Don't use makeFlags for userspace stuff
+    make library pyevdi
+  '';
+
   nativeBuildInputs = kernel.moduleBuildDependencies;
 
   buildInputs = [
@@ -43,6 +48,7 @@ stdenv.mkDerivation (finalAttrs: {
   makeFlags = kernelModuleMakeFlags ++ [
     "KVER=${kernel.modDirVersion}"
     "KDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
+    "module"
   ];
 
   hardeningDisable = [