diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index 4e49145f84..0402e73306 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -793,9 +793,7 @@
 /*
  * Include macros and defines that should only be processed once.
  */
-#ifndef HEADER_CURL_SETUP_ONCE_H
 #include "curl_setup_once.h"
-#endif
 
 /*
  * Macros and functions to safely suppress warnings