diff --git a/iceotherm/lib/analytical_solutions.py b/iceotherm/lib/analytical_solutions.py
index f6712e0..a984e1b 100644
--- a/iceotherm/lib/analytical_solutions.py
+++ b/iceotherm/lib/analytical_solutions.py
@@ -14,9 +14,9 @@
 from scipy.special import erf
 from scipy.integrate import quad
 from scipy.special import lambertw
-from .constants import constants
+from iceotherm.lib.constants import constants
 
-from .ice_properties import *
+from iceotherm.lib.ice_properties import *
 
 def Robin_T(m,T_bulk=None,const=constants(),melt=True,verbose=False):
     """
diff --git a/iceotherm/lib/cylindricalstefan/concentration_functions.py b/iceotherm/lib/cylindricalstefan/concentration_functions.py
index 26b5147..c4d8353 100644
--- a/iceotherm/lib/cylindricalstefan/concentration_functions.py
+++ b/iceotherm/lib/cylindricalstefan/concentration_functions.py
@@ -165,7 +165,7 @@ def Tf_depression(C,solute='methanol',linear=False,data_dir=None,const=const):
         return Tf
     else:
         if data_dir is None:
-            data_dir='./data/'
+            data_dir='../../../data/'
         if solute=='methanol':
             # Get percent by mass
             PBM = C_pbm(C,const.rhom)
diff --git a/iceotherm/lib/ice_properties.py b/iceotherm/lib/ice_properties.py
index 5dd5622..726a1e1 100644
--- a/iceotherm/lib/ice_properties.py
+++ b/iceotherm/lib/ice_properties.py
@@ -10,7 +10,7 @@
 
 import numpy as np
 from scipy.optimize import minimize
-from .constants import constants
+from iceotherm.lib.constants import constants
 
 # ---------------------------------------------------
 
diff --git a/iceotherm/lib/numerical_model.py b/iceotherm/lib/numerical_model.py
index 4f41fd0..e5722c2 100644
--- a/iceotherm/lib/numerical_model.py
+++ b/iceotherm/lib/numerical_model.py
@@ -12,10 +12,10 @@
 import numpy as np
 from scipy import sparse
 from scipy.integrate import cumtrapz
-from .analytical_solutions import *
-from .ice_properties import *
-from .supporting_functions import *
-from .constants import constants
+from iceotherm.lib.analytical_solutions import *
+from iceotherm.lib.ice_properties import *
+from iceotherm.lib.supporting_functions import *
+from iceotherm.lib.constants import constants
 
 # Instantiate the constants class
 const = constants()
diff --git a/iceotherm/lib/simple_conduction.py b/iceotherm/lib/simple_conduction.py
index bc7bba5..917de98 100644
--- a/iceotherm/lib/simple_conduction.py
+++ b/iceotherm/lib/simple_conduction.py
@@ -10,7 +10,7 @@
 
 import numpy as np
 from scipy.special import erfc
-from .constants import constants
+from iceotherm.lib.constants import constants
 const = constants()
 
 # Analytic solutions to conduction problems
diff --git a/iceotherm/lib/supporting_functions.py b/iceotherm/lib/supporting_functions.py
index c4ce258..03b0281 100644
--- a/iceotherm/lib/supporting_functions.py
+++ b/iceotherm/lib/supporting_functions.py
@@ -9,7 +9,7 @@
 """
 
 import numpy as np
-from .constants import constants
+from iceotherm.lib.constants import constants
 const = constants()
 from scipy.interpolate import interp1d