diff --git a/main.go b/main.go
index ac30762..5f3cd42 100644
--- a/main.go
+++ b/main.go
@@ -105,7 +105,7 @@ var configOptions = map[string][]string{
 	InfluxMeasurement: {"power"},
 	MySqlDSN:          {"-"},
 	MySqlTable:        {"home_power"},
-	IdentFilter:       {""},
+	IdentFilter:       {"-"},
 }
 
 func getUserHome() string {
diff --git a/samler.go b/samler.go
index 6cc12c0..ecdf568 100644
--- a/samler.go
+++ b/samler.go
@@ -74,14 +74,14 @@ func toFilterList(identFilter string) []string {
 	count := 0
 	for i, v := range rawIdentFilterList {
 		tmpIdentFilterList[i] = strings.TrimSpace(v)
-		if len(tmpIdentFilterList[i]) > 0 {
+		if len(tmpIdentFilterList[i]) > 0 && tmpIdentFilterList[i] != "-" {
 			count += 1
 		}
 	}
 	identFilterList := make([]string, count)
 	i := 0
 	for _, v := range tmpIdentFilterList {
-		if len(v) > 0 {
+		if len(v) > 0 && v != "-" {
 			identFilterList[i] = v
 			i += 1
 		}
diff --git a/samler_test.go b/samler_test.go
index caf4f46..18df35e 100644
--- a/samler_test.go
+++ b/samler_test.go
@@ -99,10 +99,10 @@ func TestFailedSending(t *testing.T) {
 
 func TestToEmptyFilterList(t *testing.T) {
 	// Given
-	empties := []string{"", " ", ",", " ,   , "}
+	empties := []string{"-", "", " ", ",", " ,   , "}
 
 	// When
-	mapped := [4][]string{}
+	mapped := [5][]string{}
 	for i, v := range empties {
 		mapped[i] = toFilterList(v)
 	}