diff --git a/pkgs/development/tools/misc/gdb/default.nix b/pkgs/development/tools/misc/gdb/default.nix
index 0e22aed58875..cd2eb6cc02da 100644
--- a/pkgs/development/tools/misc/gdb/default.nix
+++ b/pkgs/development/tools/misc/gdb/default.nix
@@ -20,7 +20,7 @@ let
   # having `stdenv ? cross' doesn't tell us if we're building `hostDrv' and
   # `buildDrv'.
   isGNU =
-      stdenv.system == "i586-pc-gnu"
+      stdenv.system == "i686-gnu"
       || (stdenv ? cross && stdenv.cross.config == "i586-pc-gnu");
 in