diff --git a/src/aare/daq/server.py b/src/aare/daq/server.py
index 7e338d5f..0e4e1c6f 100644
--- a/src/aare/daq/server.py
+++ b/src/aare/daq/server.py
@@ -551,6 +551,7 @@ async def steer_beam(
 
 
 @app.put("/beamline/change_energy")
+@needs_hw_lock
 async def change_energy(value: float, plot: bool = False, token: str = Depends(oauth2_scheme)):
     """
     Change monochromator energy. Staff only.