diff --git a/runtime/internal/genobj.d b/runtime/internal/genobj.d
index 694c0690..aec5872b 100644
--- a/runtime/internal/genobj.d
+++ b/runtime/internal/genobj.d
@@ -453,7 +453,7 @@ class TypeInfo_StaticArray : TypeInfo
 {
     char[] toString()
     {
-        char [10] tmp = void;
+        char [20] tmp = void;
         return value.toString() ~ "[" ~ intToUtf8(tmp, len) ~ "]";
     }