diff --git a/proxy/http2/HPACK.cc b/proxy/http2/HPACK.cc
index 75c5d3b5ab9..00103a81e3c 100644
--- a/proxy/http2/HPACK.cc
+++ b/proxy/http2/HPACK.cc
@@ -677,9 +677,7 @@ decode_indexed_header_field(MIMEFieldWrapper &header, const uint8_t *buf_start,
     int decoded_value_len;
     const char *decoded_value = header.value_get(&decoded_value_len);
 
-    Arena arena;
-    Debug("hpack_decode", "Decoded field: %s: %s", arena.str_store(decoded_name, decoded_name_len),
-          arena.str_store(decoded_value, decoded_value_len));
+    Debug("hpack_decode", "Decoded field: %.*s: %.*s", decoded_name_len, decoded_name, decoded_value_len, decoded_value);
   }
 
   return len;
@@ -770,8 +768,7 @@ decode_literal_header_field(MIMEFieldWrapper &header, const uint8_t *buf_start,
     int decoded_value_len;
     const char *decoded_value = header.value_get(&decoded_value_len);
 
-    Debug("hpack_decode", "Decoded field: %s: %s", arena.str_store(decoded_name, decoded_name_len),
-          arena.str_store(decoded_value, decoded_value_len));
+    Debug("hpack_decode", "Decoded field: %.*s: %.*s", decoded_name_len, decoded_name, decoded_value_len, decoded_value);
   }
 
   if (has_http2_violation) {