diff --git a/src/klibc/kstdio.c b/src/klibc/kstdio.c
index df73eab49bd..b5f106d9ce7 100644
--- a/src/klibc/kstdio.c
+++ b/src/klibc/kstdio.c
@@ -51,7 +51,7 @@ RTM_EXPORT(rt_snprintf);
  */
 int rt_vsprintf(char *buf, const char *format, va_list arg_ptr)
 {
-    return rt_vsnprintf(buf, (rt_size_t) - 1, format, arg_ptr);
+    return rt_vsnprintf(buf, INT32_MAX, format, arg_ptr);
 }
 RTM_EXPORT(rt_vsprintf);