diff --git a/text_formatter.go b/text_formatter.go
index e125015..6aa48cf 100644
--- a/text_formatter.go
+++ b/text_formatter.go
@@ -169,22 +169,15 @@ func (f *TextFormatter) appendKeyValue(b *bytes.Buffer, key string, value interf
 }
 
 func (f *TextFormatter) appendValue(b *bytes.Buffer, value interface{}) {
-	switch value := value.(type) {
-	case string:
-		if !f.needsQuoting(value) {
-			b.WriteString(value)
-		} else {
-			b.WriteString(f.quoteString(value))
-		}
-	case error:
-		errmsg := value.Error()
-		if !f.needsQuoting(errmsg) {
-			b.WriteString(errmsg)
-		} else {
-			b.WriteString(f.quoteString(errmsg))
-		}
-	default:
-		fmt.Fprint(b, value)
+	stringVal, ok := value.(string)
+	if !ok {
+		stringVal = fmt.Sprint(value)
+	}
+
+	if !f.needsQuoting(stringVal) {
+		b.WriteString(stringVal)
+	} else {
+		b.WriteString(f.quoteString(stringVal))
 	}
 }
 
diff --git a/text_formatter_test.go b/text_formatter_test.go
index 1fc55ae..d7b3bcb 100644
--- a/text_formatter_test.go
+++ b/text_formatter_test.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 	"testing"
 	"time"
+	"fmt"
 )
 
 func TestQuoting(t *testing.T) {
@@ -83,6 +84,27 @@ func TestEscaping_DefaultQuoteCharacter(t *testing.T) {
 	}
 }
 
+func TestEscaping_Interface(t *testing.T) {
+	tf := &TextFormatter{DisableColors: true}
+
+	ts := time.Now()
+
+	testCases := []struct {
+		value    interface{}
+		expected string
+	}{
+		{ts, fmt.Sprintf("\"%s\"", ts.String())},
+		{errors.New("error: something went wrong"), "\"error: something went wrong\""},
+	}
+
+	for _, tc := range testCases {
+		b, _ := tf.Format(WithField("test", tc.value))
+		if !bytes.Contains(b, []byte(tc.expected)) {
+			t.Errorf("escaping expected for %q (result was %q instead of %q)", tc.value, string(b), tc.expected)
+		}
+	}
+}
+
 func TestEscaping_CustomQuoteCharacter(t *testing.T) {
 	tf := &TextFormatter{DisableColors: true}