diff --git a/include/sxt/errno.h b/include/sxt/errno.h
index 904ed53..87051c6 100644
--- a/include/sxt/errno.h
+++ b/include/sxt/errno.h
@@ -47,4 +47,6 @@
 #define SXT_EINVAL          (SXT_EBASESHIFT + 22)
 #define SXT_ENOMEM          (SXT_EBASESHIFT + 42)
 
+#define SXTerr(n) (n) < 0 : -(n) ? (n)
+
 #endif /* __SXT_ERRNO_H__ */