diff --git a/config.py b/config.py
index 6c09968..0aa8c32 100644
--- a/config.py
+++ b/config.py
@@ -32,7 +32,7 @@ def __getattr__(cls, name):
                 return Mock()
 
     MOCK_MODULES = ['pyfftw', 'scipy', 'numpy', 'matplotlib', 'matplotlib.pyplot']
-	print "Mocking ", MOCK_MODULES
+	print("Mocking ", MOCK_MODULES)
     sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
 
 
diff --git a/setup.py b/setup.py
index f3778dd..8c93f44 100755
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
 if not on_rtd:
-    import numpy as np
+    # import numpy as np
     install_requires=[
           "jsonpickle>=0.9.2",
           "jsonschema>=2.5.1",
diff --git a/src/pynlo/interactions/FourWaveMixing/SSFM.py b/src/pynlo/interactions/FourWaveMixing/SSFM.py
index 91cc905..90b99b0 100755
--- a/src/pynlo/interactions/FourWaveMixing/SSFM.py
+++ b/src/pynlo/interactions/FourWaveMixing/SSFM.py
@@ -524,7 +524,7 @@ def propagate(self, pulse_in, fiber, n_steps, output_power=None, reload_fiber_ea
         
 
         for i in range(n_steps):                        
-            print ("Step:", i, "Distance remaining:", fiber.length * (1 - np.float(i)/n_steps) )
+            print ("Step:", i, "Distance remaining:", fiber.length * (1 - np.float16(i)/n_steps) )
             
             if reload_fiber_each_step:
                 self.load_fiber_parameters(pulse_in, fiber, output_power, z=i*delta_z)