diff --git a/pkgs/servers/foundationdb/cmake.nix b/pkgs/servers/foundationdb/cmake.nix
index ac7733986ce6..512842b3a6a2 100644
--- a/pkgs/servers/foundationdb/cmake.nix
+++ b/pkgs/servers/foundationdb/cmake.nix
@@ -4,7 +4,7 @@
 , cmake, ninja, boost, python3, openjdk, mono, libressl
 
 , gccStdenv, llvmPackages
-, useClang ? true
+, useClang ? false
 , ...
 }:
 
diff --git a/pkgs/servers/foundationdb/default.nix b/pkgs/servers/foundationdb/default.nix
index de29145a0745..ea762ed656d6 100644
--- a/pkgs/servers/foundationdb/default.nix
+++ b/pkgs/servers/foundationdb/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, stdenv49, gcc9Stdenv, llvmPackages_8
+{ stdenv, stdenv49, gccStdenv, llvmPackages
 , lib, fetchurl, fetchpatch, fetchFromGitHub
 
 , cmake, ninja, which, findutils, m4, gawk
@@ -8,8 +8,8 @@
 let
   vsmakeBuild = import ./vsmake.nix args;
   cmakeBuild = import ./cmake.nix (args // {
-    gccStdenv    = gcc9Stdenv;
-    llvmPackages = llvmPackages_8;
+    gccStdenv    = gccStdenv;
+    llvmPackages = llvmPackages;
   });
 
   python3-six-patch = fetchpatch {