diff --git a/src/os_unix.h b/src/os_unix.h
index dd70939..944cc1b 100644
--- a/src/os_unix.h
+++ b/src/os_unix.h
@@ -53,9 +53,7 @@
 #endif
 
 #ifdef HAVE_UNISTD_H
-# ifndef S_SPLINT_S  /* splint crashes on bits/confname.h */
-#  include <unistd.h>
-# endif
+# include <unistd.h>
 #endif
 
 #ifdef HAVE_LIBC_H