diff --git a/src/html-parse.c b/src/html-parse.c
index 30c8ae8e..63677324 100644
--- a/src/html-parse.c
+++ b/src/html-parse.c
@@ -777,11 +777,27 @@ find_comment_end (const char *beg, const char *end)
 static bool
 name_allowed (const struct hash_table *ht, const char *b, const char *e)
 {
-  char *copy;
+  char buf[256], *copy;
+  size_t len = e - b;
+  bool ret;
+
   if (!ht)
     return true;
-  BOUNDED_TO_ALLOCA (b, e, copy);
-  return hash_table_get (ht, copy) != NULL;
+
+  if (len < sizeof (buf))
+    copy = buf;
+  else
+    copy = xmalloc (len + 1);
+
+  memcpy (copy, b, len);
+  copy[len] = 0;
+
+  ret = hash_table_get (ht, copy) != NULL;
+
+  if (copy != buf)
+    xfree (copy);
+
+  return ret;
 }
 
 /* Advance P (a char pointer), with the explicit intent of being able