diff --git a/libs/libc/include/stdlib.h b/libs/libc/include/stdlib.h
index dfb18dbb..a665c356 100644
--- a/libs/libc/include/stdlib.h
+++ b/libs/libc/include/stdlib.h
@@ -10,6 +10,8 @@
 
 #define RAND_MAX INT_MAX // Maximum number returned by rand().
 
+#define MB_CUR_MAX 1 // Maximum length of multibyte characters in the current locale.
+
 // Return type for an integer division.
 typedef struct
 {