diff --git a/stubs/pexpect/pexpect/spawnbase.pyi b/stubs/pexpect/pexpect/spawnbase.pyi
index da634e764..b8e5fbb87 100644
--- a/stubs/pexpect/pexpect/spawnbase.pyi
+++ b/stubs/pexpect/pexpect/spawnbase.pyi
@@ -41,7 +41,7 @@ class SpawnBase:
     logfile_send: _Logfile
     maxread: Incomplete
     searchwindowsize: Incomplete
-    delaybeforesend: float
+    delaybeforesend: float | None
     delayafterclose: float
     delayafterterminate: float
     delayafterread: float