diff --git a/plugins/in_tcp/tcp_conn.c b/plugins/in_tcp/tcp_conn.c
index ddd15e57ab1..c42c0908a48 100644
--- a/plugins/in_tcp/tcp_conn.c
+++ b/plugins/in_tcp/tcp_conn.c
@@ -306,6 +306,7 @@ static ssize_t parse_payload_none(struct tcp_conn *conn)
                 else {
                     flb_plg_debug(ctx->ins, "parser '%s' failed on incoming data",
                                   ctx->parser_name);
+                    flb_plg_debug(ctx->ins, "unparsed log message: %.*s", (int) len, buf);
                     ret = flb_log_event_encoder_begin_record(ctx->log_encoder);
 
                     if (ret == FLB_EVENT_ENCODER_SUCCESS) {
diff --git a/plugins/in_udp/udp_conn.c b/plugins/in_udp/udp_conn.c
index 216ff9fa875..bfb1c765995 100644
--- a/plugins/in_udp/udp_conn.c
+++ b/plugins/in_udp/udp_conn.c
@@ -365,6 +365,7 @@ static ssize_t parse_payload_none(struct udp_conn *conn)
 
                     flb_plg_debug(ctx->ins, "parser '%s' failed on incoming data",
                                   ctx->parser_name);
+                    flb_plg_debug(ctx->ins, "unparsed log message: %.*s", (int) len, buf);
                     ret = flb_log_event_encoder_begin_record(ctx->log_encoder);
 
                     if (ret == FLB_EVENT_ENCODER_SUCCESS) {