diff --git a/Makefile b/Makefile
index 745e60aa5c9..c3dc83c7722 100644
--- a/Makefile
+++ b/Makefile
@@ -68,6 +68,7 @@ ifeq ($(OPTIMIZE), 1)
   GLOBAL_LDFLAGS += $(CXXLTO)
 else
   GLOBAL_CXXFLAGS += -O0 -U_FORTIFY_SOURCE
+  unexport NIX_HARDENING_ENABLE
 endif
 
 include mk/platform.mk
diff --git a/flake.nix b/flake.nix
index 58d17bf0092..42aaace6746 100644
--- a/flake.nix
+++ b/flake.nix
@@ -396,6 +396,7 @@
             # Make bash completion work.
             XDG_DATA_DIRS+=:$out/share
           '';
+
           nativeBuildInputs = attrs.nativeBuildInputs or []
             # TODO: Remove the darwin check once
             # https://github.com/NixOS/nixpkgs/pull/291814 is available