diff --git a/lib/opentok/token_generator.rb b/lib/opentok/token_generator.rb
index 1720099..3f99023 100644
--- a/lib/opentok/token_generator.rb
+++ b/lib/opentok/token_generator.rb
@@ -126,7 +126,6 @@ def generate_token(token_type)
         :iss => api_key,
         :ist => "project",
         :iat => Time.now.to_i,
-        :exp => Time.now.to_i + 86400,
         :nonce => Random.rand,
         :role => role,
         :scope => "session.connect",