diff --git a/pkgs/os-specific/linux/sgx/psw/default.nix b/pkgs/os-specific/linux/sgx/psw/default.nix
index 4a5e50d9c6ab..fa4a7be01cf5 100644
--- a/pkgs/os-specific/linux/sgx/psw/default.nix
+++ b/pkgs/os-specific/linux/sgx/psw/default.nix
@@ -59,7 +59,10 @@ stdenv.mkDerivation rec {
     protobuf
   ];
 
-  hardeningDisable = lib.optionals debug [
+  hardeningDisable = [
+    # causes redefinition of _FORTIFY_SOURCE
+    "fortify3"
+  ] ++ lib.optionals debug [
     "fortify"
   ];