diff --git a/helper/validation/validation.go b/helper/validation/validation.go
index 6c3b29a45..1fc3a6c09 100644
--- a/helper/validation/validation.go
+++ b/helper/validation/validation.go
@@ -216,7 +216,7 @@ func ValidateRegexp(v interface{}, k string) (ws []string, errors []error) {
 // as time.RFC3339 format
 func ValidateRFC3339TimeString(v interface{}, k string) (ws []string, errors []error) {
 	if _, err := time.Parse(time.RFC3339, v.(string)); err != nil {
-		errors = append(errors, fmt.Errorf("%q: %s", k, err))
+		errors = append(errors, fmt.Errorf("%q: invalid RFC3339 timestamp", k))
 	}
 	return
 }
diff --git a/helper/validation/validation_test.go b/helper/validation/validation_test.go
index 82932ba51..0e77006d4 100644
--- a/helper/validation/validation_test.go
+++ b/helper/validation/validation_test.go
@@ -161,37 +161,37 @@ func TestValidateRFC3339TimeString(t *testing.T) {
 		{
 			val:         "03/01/2018",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`cannot parse "1/2018" as "2006"`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 		{
 			val:         "03-01-2018",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`cannot parse "1-2018" as "2006"`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 		{
 			val:         "2018-03-01",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`cannot parse "" as "T"`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 		{
 			val:         "2018-03-01T",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`cannot parse "" as "15"`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 		{
 			val:         "2018-03-01T00:00:00",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`cannot parse "" as "Z07:00"`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 		{
 			val:         "2018-03-01T00:00:00Z05:00",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`extra text: 05:00`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 		{
 			val:         "2018-03-01T00:00:00Z-05:00",
 			f:           ValidateRFC3339TimeString,
-			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`extra text: -05:00`)),
+			expectedErr: regexp.MustCompile(regexp.QuoteMeta(`invalid RFC3339 timestamp`)),
 		},
 	})
 }