diff --git a/traffic_monitor/cache/cache.go b/traffic_monitor/cache/cache.go
index 8b51d68f25..756662c4bd 100644
--- a/traffic_monitor/cache/cache.go
+++ b/traffic_monitor/cache/cache.go
@@ -310,7 +310,7 @@ func (handler Handler) Handle(id string, rdr io.Reader, format string, reqTime t
 	if val, ok := miscStats["plugin.system_stats.timestamp_ms"]; ok {
 		valInt, valErr := strconv.ParseInt(val.(string), 10, 64)
 		if valErr != nil {
-			log.Errorf("parse error '%s'", valErr.Error())
+			log.Errorln("parse error: ", valErr)
 			result.Error = valErr
 			handler.resultChan <- result
 			return
diff --git a/traffic_monitor/cache/cache_test.go b/traffic_monitor/cache/cache_test.go
index 25a8b3b62d..75dc640829 100644
--- a/traffic_monitor/cache/cache_test.go
+++ b/traffic_monitor/cache/cache_test.go
@@ -25,6 +25,7 @@ import (
 	"net/http"
 	"testing"
 
+	"github.com/apache/trafficcontrol/lib/go-rfc"
 	"github.com/apache/trafficcontrol/lib/go-tc"
 	"github.com/apache/trafficcontrol/lib/go-util"
 	"github.com/apache/trafficcontrol/traffic_monitor/poller"
@@ -108,7 +109,7 @@ func TestParseAndDecode(t *testing.T) {
 
 	pl := &poller.HTTPPollCtx{HTTPHeader: http.Header{}}
 	ctx := interface{}(pl)
-	ctx.(*poller.HTTPPollCtx).HTTPHeader.Set("Content-Type", "application/json")
+	ctx.(*poller.HTTPPollCtx).HTTPHeader.Set("Content-Type", rfc.ApplicationJSON)
 
 	decoder, err := GetDecoder("stats_over_http")
 	if err != nil {