diff --git a/lib/std/libc/os/errno.c3 b/lib/std/libc/os/errno.c3
index 54ab94136..3c1c3ee29 100644
--- a/lib/std/libc/os/errno.c3
+++ b/lib/std/libc/os/errno.c3
@@ -1,5 +1,7 @@
 module libc::os @if(env::LIBC);
+import std::core::env;
 
+const HAS_NATIVE_ERRNO = env::LINUX || env::ANDROID || env::DARWIN || env::WIN32;
 // Linux
 extern fn int* __errno_location() @if(env::LINUX);
 macro int errno() @if(env::LINUX) => *__errno_location();
@@ -27,7 +29,7 @@ extern fn void _get_errno(int* result) @if(env::WIN32);
 extern fn void _set_errno(int err) @if(env::WIN32);
 
 // Default
-module libc::os @if(!env::LIBC || !(env::LINUX || env::DARWIN || env::WIN32));
+module libc::os @if(!env::LIBC || !HAS_NATIVE_ERRNO);
 tlocal int _errno_c3 = 0;
 fn void errno_set(int err) => _errno_c3 = err;
 fn int errno() => _errno_c3;