diff --git a/pkgs/development/compilers/llvm/common/clang/default.nix b/pkgs/development/compilers/llvm/common/clang/default.nix
index e597ec4d604b..dc175e085f0b 100644
--- a/pkgs/development/compilers/llvm/common/clang/default.nix
+++ b/pkgs/development/compilers/llvm/common/clang/default.nix
@@ -198,7 +198,7 @@ let
       '';
     })
   // (lib.optionalAttrs (lib.versionAtLeast release_version "15") {
-    env = lib.optionalAttrs (stdenv.buildPlatform != stdenv.hostPlatform) {
+    env = lib.optionalAttrs (stdenv.buildPlatform != stdenv.hostPlatform && !stdenv.hostPlatform.useLLVM) {
       # The following warning is triggered with (at least) gcc >=
       # 12, but appears to occur only for cross compiles.
       NIX_CFLAGS_COMPILE = "-Wno-maybe-uninitialized";