diff --git a/qspace.py b/qspace.py
index 7789580..6930afc 100644
--- a/qspace.py
+++ b/qspace.py
@@ -244,7 +244,8 @@ phi = Motor("SATES30-RIXS:MOT_SRX.VAL")
 nu = Motor("SATES30-RIXS:MOT_DRY.VAL")
 
 # and this to the machine wavelength (maybe this needs to be calculated from the energy? then we should add a Wavelength wrapper...)
-wl = Wavelength(PVAdjustable("MACHINE:ENERGY"))
+# wl = Wavelength(PVAdjustable("MACHINE:ENERGY"))
+wl = Wavelength(mono)
 
 # put it all together:
 q = QSpace3D("SOMETHING:Q", mu, chi, phi, nu, wl)