diff --git a/formatter_keyvalue.go b/formatter_keyvalue.go
index ee20852..2607dce 100644
--- a/formatter_keyvalue.go
+++ b/formatter_keyvalue.go
@@ -65,7 +65,7 @@ func (formatter *FormatterKeyValue) addKV(key string, value any) {
 	val := fmt.Sprintf("%v", value)
 
 	// check, if value should be escaped
-	if strings.ContainsAny(val, " \t\n\r=") {
+	if strings.ContainsAny(val, " \t\n\r=:\\") {
 		val = fmt.Sprintf("%q", val)
 	}
 
diff --git a/formatter_keyvalue_test.go b/formatter_keyvalue_test.go
index 97339b4..0faa5e7 100644
--- a/formatter_keyvalue_test.go
+++ b/formatter_keyvalue_test.go
@@ -26,7 +26,7 @@ func TestFormatterKeyValue(t *testing.T) {
 		},
 		Level: LevelInfo,
 	}
-	result := `time=0001-01-01T00:00:00Z level=INFO message="Some Text" k1=v1 k2=v2`
+	result := `time="0001-01-01T00:00:00Z" level=INFO message="Some Text" k1=v1 k2=v2`
 
 	// execute formatter
 	formatter := NewFormatterKeyValue()