diff --git a/oauth.go b/oauth.go
index 2eccbdc..dc15d53 100644
--- a/oauth.go
+++ b/oauth.go
@@ -29,12 +29,13 @@ type TokenResponse struct {
 
 // InspectResponse contains data returned when an access token is inspected.
 type InspectResponse struct {
-	ClientID  string    `json:"client_id"`
-	UserID    string    `json:"user_id"`
-	ExpiresAt time.Time `json:"expires_at"`
-	Username  string    `json:"username"`
-	Email     string    `json:"email"`
-	Error     string    `json:"error"`
+	ClientID    string    `json:"client_id"`
+	UserID      string    `json:"user_id"`
+	ExpiresAt   time.Time `json:"expires_at"`
+	Username    string    `json:"username"`
+	DisplayName string    `json:"-"`
+	Email       string    `json:"email"`
+	Error       string    `json:"error"`
 }
 
 // tokenRequestMaxLen is the most bytes that we'll read from the /oauth/token
@@ -194,8 +195,12 @@ func (h oauthHandler) viewOauthCallback(w http.ResponseWriter, r *http.Request)
 			Email:      zero.NewString(tokenInfo.Email, tokenInfo.Email != ""),
 			Created:    time.Now().Truncate(time.Second).UTC(),
 		}
+		displayName := tokenInfo.DisplayName
+		if len(displayName) == 0 {
+			displayName = tokenInfo.Username
+		}
 
-		err = h.DB.CreateUser(h.Config, newUser, newUser.Username)
+		err = h.DB.CreateUser(h.Config, newUser, displayName)
 		if err != nil {
 			failOAuthRequest(w, http.StatusInternalServerError, err.Error())
 			return
diff --git a/oauth_slack.go b/oauth_slack.go
index 32ceea0..066aa18 100644
--- a/oauth_slack.go
+++ b/oauth_slack.go
@@ -150,9 +150,10 @@ func (c slackOauthClient) inspectOauthAccessToken(ctx context.Context, accessTok
 
 func (resp slackUserIdentityResponse) InspectResponse() *InspectResponse {
 	return &InspectResponse{
-		UserID:   resp.User.ID,
-		Username: slug.Make(resp.User.Name),
-		Email:    resp.User.Email,
+		UserID:      resp.User.ID,
+		Username:    slug.Make(resp.User.Name),
+		DisplayName: resp.User.Name,
+		Email:       resp.User.Email,
 	}
 }