diff --git a/pkgs/development/ocaml-modules/llvm/default.nix b/pkgs/development/ocaml-modules/llvm/default.nix
index 93824894455..948d326d659 100644
--- a/pkgs/development/ocaml-modules/llvm/default.nix
+++ b/pkgs/development/ocaml-modules/llvm/default.nix
@@ -14,6 +14,10 @@ stdenv.mkDerivation {
 
   strictDeps = true;
 
+  preConfigure = lib.optionalString (lib.versionAtLeast version "13.0.0") ''
+    cd llvm
+  '';
+
   cmakeFlags = [
     "-DBUILD_SHARED_LIBS=YES" # fixes bytecode builds
     "-DLLVM_OCAML_OUT_OF_TREE=TRUE"