diff --git a/libpsx/include/errno.h b/libpsx/include/errno.h
index cfaa8fd..0a68f75 100644
--- a/libpsx/include/errno.h
+++ b/libpsx/include/errno.h
@@ -15,9 +15,7 @@
  * BSD license
  */
 
-#ifndef __IN_LIBPSX
 extern int errno;
-#endif
 
 #define	EPERM		1		/* Operation not permitted */
 #define	ENOENT		2		/* No such file or directory */