diff --git a/pkgs/development/compilers/nim/default.nix b/pkgs/development/compilers/nim/default.nix
index 692f5331d0b8..131a27b6f544 100644
--- a/pkgs/development/compilers/nim/default.nix
+++ b/pkgs/development/compilers/nim/default.nix
@@ -285,9 +285,6 @@ in {
 
         "--set NIM_CONFIG_PATH ${placeholder "out"}/etc/nim"
         # Use the custom configuration
-
-        ''--set NIX_HARDENING_ENABLE "''${NIX_HARDENING_ENABLE/fortify}"''
-        # Fortify hardening appends -O2 to gcc flags which is unwanted for unoptimized nim builds.
       ];
 
       installPhase = ''