diff --git a/cfg/ppms.cfg b/cfg/ppms.cfg
index 82cc65e..6091d00 100644
--- a/cfg/ppms.cfg
+++ b/cfg/ppms.cfg
@@ -12,6 +12,7 @@ io = ppms
 
 [mf]
 class = secop_psi.ppms.Field
+target=0
 target.min = -9
 target.max = 9
 description = magnetic field