diff --git a/Source/DOH/string.c b/Source/DOH/string.c
index 50676c7c3..3e02e05d1 100644
--- a/Source/DOH/string.c
+++ b/Source/DOH/string.c
@@ -1114,6 +1114,7 @@ DOHString *DohNewStringWithSize(const DOHString_or_char *so, int len) {
   str->maxsize = max;
   if (s) {
     strncpy(str->str, s, len);
+    str->str[l] = 0;
     str->len = l;
     str->sp = l;
   } else {