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-rw-r--r--pkgs/tools/misc/edk2-uefi-shell/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/misc/edk2-uefi-shell/default.nix b/pkgs/tools/misc/edk2-uefi-shell/default.nix
index 3f037755fb0..7547f9b3e47 100644
--- a/pkgs/tools/misc/edk2-uefi-shell/default.nix
+++ b/pkgs/tools/misc/edk2-uefi-shell/default.nix
@@ -14,7 +14,7 @@ edk2.mkDerivation "ShellPkg/ShellPkg.dsc" (finalAttrs: {
     ++ lib.optionals stdenv.cc.isClang [ llvmPackages.bintools llvmPackages.llvm ];
   strictDeps = true;
 
-  env.NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isClang [ "-fno-pic" "-Qunused-arguments" ];
+  env.NIX_CFLAGS_COMPILE = toString (lib.optionals stdenv.cc.isClang [ "-fno-pic" "-Qunused-arguments" ]);
 
   # Set explicitly to use Python 3 from nixpkgs. Otherwise, the build system will detect and try to
   # use `/usr/bin/python3` on Darwin when sandboxing is disabled.