diff --git a/weed/iam/sts/session_helpers.go b/weed/iam/sts/session_helpers.go
deleted file mode 100644
index 64abc23d4..000000000
--- a/weed/iam/sts/session_helpers.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package sts
-
-import "time"
-
-// IsExpired returns true if the credentials have expired
-func (c *Credentials) IsExpired() bool {
-	if c == nil {
-		return true
-	}
-	// Treat zero-time expiration as expired (uninitialized credentials)
-	// This prevents treating uninitialized credentials as valid
-	if c.Expiration.IsZero() {
-		return true
-	}
-	return time.Now().After(c.Expiration)
-}
-
-// IsExpired returns true if the session has expired
-func (s *SessionInfo) IsExpired() bool {
-	// If SessionInfo is nil, consider it expired
-	if s == nil {
-		return true
-	}
-	// Treat zero-time expiration as expired (uninitialized session)
-	if s.ExpiresAt.IsZero() {
-		return true
-	}
-	return time.Now().After(s.ExpiresAt)
-}