diff --git a/include/stdint.h b/include/stdint.h
index 327042be..6cc503a4 100644
--- a/include/stdint.h
+++ b/include/stdint.h
@@ -129,6 +129,8 @@ typedef long uintptr_t;
 #define SIZE_MAX UINT64_MAX
 #endif
 
+#define SSIZE_MAX LONG_MAX
+
 #endif // ! SYSTEM_LIBC
 
 #endif // __MES_STDINT_H