diff --git a/example/server/storage/oidc.go b/example/server/storage/oidc.go
index 9cd08d9..22c0295 100644
--- a/example/server/storage/oidc.go
+++ b/example/server/storage/oidc.go
@@ -121,7 +121,7 @@ func (a *AuthRequest) Done() bool {
 }
 
 func PromptToInternal(oidcPrompt oidc.SpaceDelimitedArray) []string {
-	prompts := make([]string, len(oidcPrompt))
+	prompts := make([]string, 0, len(oidcPrompt))
 	for _, oidcPrompt := range oidcPrompt {
 		switch oidcPrompt {
 		case oidc.PromptNone,