diff --git a/config/appservice.go b/config/appservice.go
index f6768b1..f081c37 100644
--- a/config/appservice.go
+++ b/config/appservice.go
@@ -12,3 +12,28 @@ type appservice struct {
 	ASToken string `yaml:"as_token"`
 	HSToken string `yaml:"hs_token"`
 }
+
+func (a *appservice) setDefaults() error {
+	if a.ID == "" {
+		a.ID = "discord"
+	}
+
+	if err := a.Bot.setDefaults(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (a *appservice) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type rawAppservice appservice
+
+	raw := rawAppservice{}
+	if err := unmarshal(&raw); err != nil {
+		return err
+	}
+
+	*a = appservice(raw)
+
+	return a.setDefaults()
+}
diff --git a/config/bot.go b/config/bot.go
index 4318823..71e2ed6 100644
--- a/config/bot.go
+++ b/config/bot.go
@@ -5,3 +5,29 @@ type bot struct {
 	Displayname string `yaml:"displayname"`
 	Avatar      string `yaml:"avatar"`
 }
+
+func (b *bot) setDefaults() error {
+	if b.Username == "" {
+		b.Username = "discordbot"
+	}
+
+	if b.Displayname == "" {
+		b.Displayname = "Discord Bridge Bot"
+	}
+
+	return nil
+}
+
+func (b *bot) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type rawBot bot
+
+	raw := rawBot{}
+
+	if err := unmarshal(&raw); err != nil {
+		return err
+	}
+
+	*b = bot(raw)
+
+	return b.setDefaults()
+}
diff --git a/config/bridge.go b/config/bridge.go
index 4ff6324..62cf233 100644
--- a/config/bridge.go
+++ b/config/bridge.go
@@ -1,6 +1,8 @@
 package config
 
 import (
+	"fmt"
+
 	"bytes"
 	"text/template"
 )
@@ -11,6 +13,21 @@ type bridge struct {
 	usernameTemplate *template.Template `yaml:"-"`
 }
 
+func (b *bridge) setDefaults() error {
+	var err error
+
+	if b.UsernameTemplate == "" {
+		b.UsernameTemplate = "Discord_{{.}}"
+	}
+
+	b.usernameTemplate, err = template.New("username").Parse(b.UsernameTemplate)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
 func (b *bridge) UnmarshalYAML(unmarshal func(interface{}) error) error {
 	type rawBridge bridge
 
@@ -21,19 +38,16 @@ func (b *bridge) UnmarshalYAML(unmarshal func(interface{}) error) error {
 		return err
 	}
 
-	raw.usernameTemplate, err = template.New("username").Parse(raw.UsernameTemplate)
-	if err != nil {
-		return err
-	}
-
 	*b = bridge(raw)
 
-	return nil
+	return b.setDefaults()
 }
 
 func (b bridge) FormatUsername(userid string) string {
 	var buffer bytes.Buffer
 
+	fmt.Printf("bridge: %#v\n", b)
+
 	b.usernameTemplate.Execute(&buffer, userid)
 
 	return buffer.String()
diff --git a/config/config.go b/config/config.go
index fe89d2b..8ace6ff 100644
--- a/config/config.go
+++ b/config/config.go
@@ -12,6 +12,29 @@ type Config struct {
 	Bridge     bridge     `yaml:"bridge"`
 }
 
+func (cfg *Config) setDefaults() error {
+	if err := cfg.Appservice.setDefaults(); err != nil {
+		return err
+	}
+
+	if err := cfg.Bridge.setDefaults(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (cfg *Config) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type rawConfig Config
+
+	raw := rawConfig{}
+	if err := unmarshal(&raw); err != nil {
+		return err
+	}
+
+	return cfg.setDefaults()
+}
+
 func FromBytes(data []byte) (*Config, error) {
 	cfg := Config{}
 
@@ -19,6 +42,8 @@ func FromBytes(data []byte) (*Config, error) {
 		return nil, err
 	}
 
+	cfg.setDefaults()
+
 	return &cfg, nil
 }