diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index 4b97919f3873221f0d34ca942d46c71edc9e1c62..b23e3120c5f2abeb27f6b30ab7662c04b1358b5e 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -436,6 +436,7 @@ class OhmPiHardware:
             diff_vab = np.inf
             if strategy == 'constant':
                 tx_volt = vab_max*.9
+                strategy = 'vmax'
             if strategy == 'vmax':
                 while (k < n_steps) and (diff_vab > diff_vab_lim) and (vab_list[k] < vab_max):
                     vabs = []