diff --git a/decam/camGeom/camera.py b/decam/camGeom/camera.py
index 417eef5f..c33e82ee 100644
--- a/decam/camGeom/camera.py
+++ b/decam/camGeom/camera.py
@@ -6,6 +6,9 @@
 # Plate scale of the camera in arcsec/mm
 config.plateScale = 17.575
 
+# We should add a flip in the X axis between FOCAL_PLANE and FIELD_ANGLE.
+config.focalPlaneParity = True
+
 # Name of native coordinate system
 config.transformDict.nativeSys = 'FocalPlane'