diff --git a/src/tool_writeout.c b/src/tool_writeout.c
index d5b0bc44f..27b2ac50d 100644
--- a/src/tool_writeout.c
+++ b/src/tool_writeout.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -314,6 +314,9 @@ void ourWriteOut(CURL *curl, struct OutStruct *outs, const char *writeinfo)
                   case CURL_HTTP_VERSION_2_0:
                     version = "2";
                     break;
+                  case CURL_HTTP_VERSION_3:
+                    version = "3";
+                    break;
                   }
 
                   fprintf(stream, version);