diff --git a/ot_stats.c b/ot_stats.c
index a976713..1f5e5e9 100644
--- a/ot_stats.c
+++ b/ot_stats.c
@@ -55,7 +55,7 @@ static unsigned long long ot_full_scrape_count = 0;
 static unsigned long long ot_full_scrape_request_count = 0;
 static unsigned long long ot_full_scrape_size = 0;
 static unsigned long long ot_failed_request_counts[CODE_HTTPERROR_COUNT];
-static char *             ot_failed_request_names[] = { "302 Redirect", "400 Parse Error", "400 Invalid Parameter", "400 Invalid Parameter (compact=0)", "403 Access Denied", "404 Not found", "500 Internal Server Error" };
+static char *             ot_failed_request_names[] = { "302 Redirect", "400 Parse Error", "400 Invalid Parameter", "400 Invalid Parameter (compact=0)", "400 Not Modest", "403 Access Denied", "404 Not found", "500 Internal Server Error" };
 static unsigned long long ot_renewed[OT_PEER_TIMEOUT];
 static unsigned long long ot_overall_sync_count;
 static unsigned long long ot_overall_stall_count;