diff --git a/lib/setup.h b/lib/setup.h
index 69cc6d3d9..c821bc6b4 100644
--- a/lib/setup.h
+++ b/lib/setup.h
@@ -599,7 +599,7 @@ int netware_init(void);
  * Include macros and defines that should only be processed once.
  */
 
-#ifndef HEADER_CURL_SETUP_ONCE_H
+#ifndef __SETUP_ONCE_H
 #include "setup_once.h"
 #endif
 
diff --git a/lib/setup_once.h b/lib/setup_once.h
index 64cfeeaac..fad6f3213 100644
--- a/lib/setup_once.h
+++ b/lib/setup_once.h
@@ -1,5 +1,5 @@
-#ifndef HEADER_CURL_SETUP_ONCE_H
-#define HEADER_CURL_SETUP_ONCE_H
+#ifndef __SETUP_ONCE_H
+#define __SETUP_ONCE_H
 /***************************************************************************
  *                                  _   _ ____  _
  *  Project                     ___| | | |  _ \| |
@@ -534,4 +534,4 @@ typedef int sig_atomic_t;
 #  endif
 #endif
 
-#endif /* HEADER_CURL_SETUP_ONCE_H */
+#endif /* __SETUP_ONCE_H */
diff --git a/src/setup.h b/src/setup.h
index 58ca0efee..d2562a244 100644
--- a/src/setup.h
+++ b/src/setup.h
@@ -222,7 +222,7 @@ int fileno( FILE *stream);
  * Include macros and defines that should only be processed once.
  */
 
-#ifndef HEADER_CURL_SETUP_ONCE_H
+#ifndef __SETUP_ONCE_H
 #include "setup_once.h"
 #endif