diff --git a/pkgs/llvm-ompss2/default.nix b/pkgs/llvm-ompss2/default.nix
index 26b9bac..fa05e64 100644
--- a/pkgs/llvm-ompss2/default.nix
+++ b/pkgs/llvm-ompss2/default.nix
@@ -39,6 +39,13 @@ let
   resetIntelCCFlags = let tconf = builtins.replaceStrings ["-"] ["_"] targetConfig;
   in writeShellScript "remove-intel.sh" ''
     if [ "$NIX_CC_WRAPPER_INTEL" = 1 ]; then
+      unset NIX_CFLAGS_COMPILE_${tconf}
+      unset NIX_CFLAGS_COMPILE_BEFORE_${tconf}
+      unset NIX_CFLAGS_LINK_${tconf}
+      unset NIX_CXXSTDLIB_COMPILE_${tconf}
+      unset NIX_CXXSTDLIB_LINK_${tconf}
+      unset NIX_GNATFLAGS_COMPILE_${tconf}
+
       unset NIX_CC_WRAPPER_FLAGS_SET_${tconf}
       unset NIX_BINTOOLS_WRAPPER_FLAGS_${tconf}
     fi