diff --git a/src/strcmp.c b/src/strcmp.c
index d2fbc2b..76a2681 100644
--- a/src/strcmp.c
+++ b/src/strcmp.c
@@ -1,6 +1,7 @@
 #include <stdio.h> /* fprintf(3), stderr */
-#ifndef EX_USAGE
-#	include <sysexits.h> /* EX_USAGE */
+#include <stdlib.h> /* EXIT_FAILURE */
+#if !defined EX_USAGE
+#	define EX_USAGE EXIT_FAILURE
 #endif
 
 static char *program_name = "strcmp";