diff --git a/ioc/startioc.py b/ioc/startioc.py
index 5412d10..2dfd92b 100644
--- a/ioc/startioc.py
+++ b/ioc/startioc.py
@@ -37,4 +37,4 @@ def startioc():
             f'epicsEnvSet("MASTERMACS1_PORT", "{config["controllers"]["masterMacs1"]["port"]}")\n')
 
     # Start the IOC itself
-    subprocess.run("st.cmd")
+    subprocess.run(root_dir + 'st.cmd')