diff --git a/addon/pycThermopack/thermopack/thermo.py b/addon/pycThermopack/thermopack/thermo.py
index c47d7dc2..fbd4cd14 100644
--- a/addon/pycThermopack/thermopack/thermo.py
+++ b/addon/pycThermopack/thermopack/thermo.py
@@ -489,7 +489,7 @@ def init_thermo(self, eos, mixing, alpha, comps, nphases,
                                                 c_len_type, c_len_type,
                                                 c_len_type, c_len_type,
                                                 c_len_type, c_len_type,
-                                                c_len_type, c_len_type]
+                                                c_len_type]
 
         self.eoslibinit_init_thermo.restype = None