diff --git a/ophyd/quadem.py b/ophyd/quadem.py
index f97dbaef..a2a4d38d 100644
--- a/ophyd/quadem.py
+++ b/ophyd/quadem.py
@@ -98,7 +98,7 @@ class QuadEM(SingleTrigger, DetectorBase):
     position_offset_calc_y = Cpt(EpicsSignal, "ComputePosOffsetY")
 
     position_scale_x = Cpt(EpicsSignal, "PositionScaleX")
-    position_scale_Y = Cpt(EpicsSignal, "PositionScaleY")
+    position_scale_y = Cpt(EpicsSignal, "PositionScaleY")
 
     image = Cpt(ImagePlugin, "image1:")
     current1 = Cpt(StatsPlugin, "Current1:")