diff --git a/pkgs/development/tools/irony-server/default.nix b/pkgs/development/tools/irony-server/default.nix
index b52cbf21168e..e2aa27a96eb5 100644
--- a/pkgs/development/tools/irony-server/default.nix
+++ b/pkgs/development/tools/irony-server/default.nix
@@ -5,13 +5,14 @@ stdenv.mkDerivation rec {
   inherit (irony) version;
 
   nativeBuildInputs = [ cmake ];
+  buildInputs = [ llvmPackages.libclang ];
 
   dontUseCmakeBuildDir = true;
 
   cmakeDir = "server";
 
   cmakeFlags = [
-    ''-DCMAKE_PREFIX_PATH=${llvmPackages.clang.cc}''
+    "-DCMAKE_PREFIX_PATH=${llvmPackages.clang-unwrapped}"
   ];
 
   src = irony.src;