diff --git a/lib/onelogin/ruby-saml/response.rb b/lib/onelogin/ruby-saml/response.rb
index c4fa3616d..d55694399 100644
--- a/lib/onelogin/ruby-saml/response.rb
+++ b/lib/onelogin/ruby-saml/response.rb
@@ -727,7 +727,7 @@ def validate_issuer
       # @return [Boolean] True if the SessionNotOnOrAfter of the AuthnStatement is valid, otherwise (when expired) False if soft=True
       # @raise [ValidationError] if soft == false and validation fails
       #
-      def validate_session_expiration(_soft = true)
+      def validate_session_expiration()
         return true if session_expires_at.nil?
 
         now = Time.now.utc