1 files changed, 0 insertions, 2 deletions
diff --git a/ruby.h b/ruby.h
index 7bac5db499..9818a3e149 100644
--- a/ruby.h
+++ b/ruby.h
@@ -682,9 +682,7 @@ typedef DWORD rb_nativethread_t;
 # define NATIVETHREAD_EQUAL(t1,t2) ((t1) == (t2))
 # define HAVE_NATIVETHREAD
 #endif
-#ifdef HAVE_NATIVETHREAD
 RUBY_EXTERN int is_ruby_native_thread();
-#endif
 
 #if defined(__cplusplus)
 }  /* extern "C" { */