diff --git a/pkgs/os-specific/bsd/netbsd/default.nix b/pkgs/os-specific/bsd/netbsd/default.nix
index d53a1afe5e6c..479ab92c7973 100644
--- a/pkgs/os-specific/bsd/netbsd/default.nix
+++ b/pkgs/os-specific/bsd/netbsd/default.nix
@@ -67,6 +67,8 @@ in lib.makeScopeWithSplicing
     HOST_SH = stdenv'.shell;
 
     MACHINE_ARCH = {
+      i486 = "i386";
+      i586 = "i386";
       i686 = "i386";
     }.${stdenv'.hostPlatform.parsed.cpu.name}
       or stdenv'.hostPlatform.parsed.cpu.name;
@@ -74,6 +76,8 @@ in lib.makeScopeWithSplicing
     MACHINE = {
       x86_64 = "amd64";
       aarch64 = "evbarm64";
+      i486 = "i386";
+      i586 = "i386";
       i686 = "i386";
     }.${stdenv'.hostPlatform.parsed.cpu.name}
       or stdenv'.hostPlatform.parsed.cpu.name;