diff --git a/clientapi/auth/user_interactive.go b/clientapi/auth/user_interactive.go
index 6caf7dcd..82ecf674 100644
--- a/clientapi/auth/user_interactive.go
+++ b/clientapi/auth/user_interactive.go
@@ -102,8 +102,7 @@ type userInteractiveFlow struct {
 // the user already has a valid access token, but we want to double-check
 // that it isn't stolen by re-authenticating them.
 type UserInteractive struct {
-	Completed []string
-	Flows     []userInteractiveFlow
+	Flows []userInteractiveFlow
 	// Map of login type to implementation
 	Types map[string]Type
 	// Map of session ID to completed login types, will need to be extended in future
@@ -116,7 +115,6 @@ func NewUserInteractive(userAccountAPI api.UserLoginAPI, cfg *config.ClientAPI)
 		Config:               cfg,
 	}
 	return &UserInteractive{
-		Completed: []string{},
 		Flows: []userInteractiveFlow{
 			{
 				Stages: []string{typePassword.Name()},
@@ -140,7 +138,6 @@ func (u *UserInteractive) IsSingleStageFlow(authType string) bool {
 
 func (u *UserInteractive) AddCompletedStage(sessionID, authType string) {
 	// TODO: Handle multi-stage flows
-	u.Completed = append(u.Completed, authType)
 	delete(u.Sessions, sessionID)
 }
 
@@ -157,7 +154,7 @@ func (u *UserInteractive) Challenge(sessionID string) *util.JSONResponse {
 	return &util.JSONResponse{
 		Code: 401,
 		JSON: Challenge{
-			Completed: u.Completed,
+			Completed: u.Sessions[sessionID],
 			Flows:     u.Flows,
 			Session:   sessionID,
 			Params:    make(map[string]interface{}),
diff --git a/clientapi/auth/user_interactive_test.go b/clientapi/auth/user_interactive_test.go
index 262e4810..001b1a6d 100644
--- a/clientapi/auth/user_interactive_test.go
+++ b/clientapi/auth/user_interactive_test.go
@@ -187,3 +187,38 @@ func TestUserInteractivePasswordBadLogin(t *testing.T) {
 		}
 	}
 }
+
+func TestUserInteractive_AddCompletedStage(t *testing.T) {
+	tests := []struct {
+		name      string
+		sessionID string
+	}{
+		{
+			name:      "first user",
+			sessionID: util.RandomString(8),
+		},
+		{
+			name:      "second user",
+			sessionID: util.RandomString(8),
+		},
+		{
+			name:      "third user",
+			sessionID: util.RandomString(8),
+		},
+	}
+	u := setup()
+	ctx := context.Background()
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, resp := u.Verify(ctx, []byte("{}"), nil)
+			challenge, ok := resp.JSON.(Challenge)
+			if !ok {
+				t.Fatalf("expected a Challenge, got %T", resp.JSON)
+			}
+			if len(challenge.Completed) > 0 {
+				t.Fatalf("expected 0 completed stages, got %d", len(challenge.Completed))
+			}
+			u.AddCompletedStage(tt.sessionID, "")
+		})
+	}
+}