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-rw-r--r--mrbgems/mruby-os-memsize/src/memsize.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-os-memsize/src/memsize.c b/mrbgems/mruby-os-memsize/src/memsize.c
index d82c6b7ed..70887a3ae 100644
--- a/mrbgems/mruby-os-memsize/src/memsize.c
+++ b/mrbgems/mruby-os-memsize/src/memsize.c
@@ -54,6 +54,7 @@ os_memsize_of_object(mrb_state* mrb, mrb_value obj)
size += mrb_objspace_page_slot_size();
if (!RSTR_EMBED_P(RSTRING(obj)) && !RSTR_SHARED_P(RSTRING(obj))) {
size += RSTRING_CAPA(obj);
+ size++; /* NUL terminator */
}
break;
case MRB_TT_CLASS: