diff --git a/tests/ioc_plugin.py b/tests/ioc_plugin.py
index 26b89fa85..6c01aaa38 100644
--- a/tests/ioc_plugin.py
+++ b/tests/ioc_plugin.py
@@ -4,7 +4,7 @@ import epics
 
 PREFIX_ENV = "TEST_PV_PREFIX"
 DEFAULT_PREFIX = "TEST:"
-MOTOR_IDS = [f"M{i}" for i in range(1, 14)]
+MOTOR_IDS = [f"M{i}" for i in range(1, 16)]
 
 # ---- Robust MorIOC loader (handles namespace packages)
 def _load_morioc():