diff --git a/pkgs/development/tools/irony-server/default.nix b/pkgs/development/tools/irony-server/default.nix
index 2a7a7b1a16a3..192a33ad7ca7 100644
--- a/pkgs/development/tools/irony-server/default.nix
+++ b/pkgs/development/tools/irony-server/default.nix
@@ -1,20 +1,16 @@
-{ lib, stdenv, cmake, llvmPackages, irony }:
+{ lib, stdenv, cmake, llvmPackages, llvm, irony }:
 
 stdenv.mkDerivation {
   pname = "irony-server";
   inherit (irony) src version;
 
-  nativeBuildInputs = [ cmake llvmPackages.llvm.dev ];
-  buildInputs = [ llvmPackages.libclang llvmPackages.llvm ];
+  nativeBuildInputs = [ cmake llvm ];
+  buildInputs = [ llvmPackages.libclang ];
 
   dontUseCmakeBuildDir = true;
 
   cmakeDir = "server";
 
-  cmakeFlags = [
-    "-DCMAKE_PREFIX_PATH=${llvmPackages.clang-unwrapped}"
-  ];
-
   meta = with lib; {
     description = "The server part of irony";
     homepage = "https://melpa.org/#/irony";