diff --git a/trycatch.h b/trycatch.h
index 1ce82ae..9a7ce89 100644
--- a/trycatch.h
+++ b/trycatch.h
@@ -25,8 +25,8 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef __TRYCATCH_H__
-#define __TRYCATCH_H__
+#ifndef TRYCATCH_H_INCLUDED
+#define TRYCATCH_H_INCLUDED
 
 #include <setjmp.h>
 #include <stdnoreturn.h>