diff --git a/pkgs/os-specific/linux/kernel/hardened-config.nix b/pkgs/os-specific/linux/kernel/hardened-config.nix
index a8bbf4eba15..6c3d3c41908 100644
--- a/pkgs/os-specific/linux/kernel/hardened-config.nix
+++ b/pkgs/os-specific/linux/kernel/hardened-config.nix
@@ -22,7 +22,7 @@ ${optionalString (versionAtLeast version "4.10") ''
   BUG_ON_DATA_CORRUPTION y
 ''}
 
-${optionalString (stdenv.system == "x86_64-linux") ''
+${optionalString (stdenv.platform.kernelArch == "x86_64") ''
   DEFAULT_MMAP_MIN_ADDR 65536 # Prevent allocation of first 64K of memory
 
   # Reduce attack surface by disabling various emulations