diff --git a/src/link.c b/src/link.c
index 8c85b3e..ed856ce 100644
--- a/src/link.c
+++ b/src/link.c
@@ -200,9 +200,11 @@ void Link_set_file_stat(Link* this_link, CURL *curl)
         }
     } else {
         fprintf(stderr, "Link_set_file_stat(): HTTP %ld", http_resp);
-        if (http_resp == HTTP_TOO_MANY_REQUESTS) {
+        if ((http_resp == HTTP_TOO_MANY_REQUESTS) ||
+            (http_resp == HTTP_UNKNOWN_ERROR)) {
             fprintf(stderr, ", retrying later.\n");
         } else {
+            fprintf(stderr, "\n");
             this_link->type = LINK_INVALID;
         }
         fprintf(stderr, ".\n");
diff --git a/src/network.h b/src/network.h
index 8f6876c..361e8f4 100644
--- a/src/network.h
+++ b/src/network.h
@@ -12,7 +12,8 @@ typedef enum {
     HTTP_OK                     = 200,
     HTTP_PARTIAL_CONTENT        = 206,
     HTTP_RANGE_NOT_SATISFIABLE  = 416,
-    HTTP_TOO_MANY_REQUESTS      = 429
+    HTTP_TOO_MANY_REQUESTS      = 429,
+    HTTP_UNKNOWN_ERROR          = 520
 } HTTPResponseCode;
 
 typedef enum {