diff --git a/nix-meson-build-support/big-objs/meson.build b/nix-meson-build-support/big-objs/meson.build
index f5abd8bd8..7e422abd8 100644
--- a/nix-meson-build-support/big-objs/meson.build
+++ b/nix-meson-build-support/big-objs/meson.build
@@ -1,4 +1,6 @@
-# libexpr's primops creates a large object
-# Without the following flag, we'll get errors when cross-compiling to mingw32:
-# Fatal error: can't write 66 bytes to section .text of src/libexpr/libnixexpr.dll.p/primops.cc.obj: 'file too big'
-add_project_arguments([ '-Wa,-mbig-obj' ], language: 'cpp')
+if host_machine.system() == 'windows'
+  # libexpr's primops creates a large object
+  # Without the following flag, we'll get errors when cross-compiling to mingw32:
+  # Fatal error: can't write 66 bytes to section .text of src/libexpr/libnixexpr.dll.p/primops.cc.obj: 'file too big'
+  add_project_arguments([ '-Wa,-mbig-obj' ], language: 'cpp')
+endif