diff --git a/libmaxsi/decl/errno_values.h b/libmaxsi/decl/errno_values.h
index d8ff189e..7c0cd67a 100644
--- a/libmaxsi/decl/errno_values.h
+++ b/libmaxsi/decl/errno_values.h
@@ -33,4 +33,6 @@
 #define ELAKE 41
 #define EMFILE 42
 
+#define EOPNOTSUPP ENOTSUP
+
 #endif