diff --git a/doc/conf.py b/doc/conf.py
index 5e7d1d8b..45926c39 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -25,6 +25,19 @@
 # If your documentation needs a minimal Sphinx version, state it here.
 #needs_sphinx = '1.0'
 
+#pretend to have the following dependecies (needed for autodoc generation)
+from mock import Mock as MagicMock
+class Mock(MagicMock):
+    pi = 3.141592653589793
+    @classmethod
+    def __getattr__(cls, name):
+        return Mock()
+
+MOCK_MODULES = ['numpy', 'matplotlib.colors', 'matplotlib.pyplot', 'matplotlib',
+                'scipy', 'scipy.ndimage',
+                'scipy.ndimage.interpolation', 'matplotlib.ticker']
+sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
+
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
diff --git a/pip-requirements.txt b/pip-requirements.txt
index 35c5e144..6d26535b 100644
--- a/pip-requirements.txt
+++ b/pip-requirements.txt
@@ -1,5 +1,6 @@
 --index-url https://pypi.python.org/simple/
 
+mock
 pep8
 nose
 -e .
diff --git a/postpic/analyzer/analyzer.py b/postpic/analyzer/analyzer.py
index 9ea9af85..dcb8142b 100644
--- a/postpic/analyzer/analyzer.py
+++ b/postpic/analyzer/analyzer.py
@@ -16,6 +16,7 @@
 #
 # Stephan Kuschel 2014
 import re
+import numpy as np
 
 __all__ = ['PhysicalConstants', 'SpeciesIdentifier']
 
@@ -24,7 +25,6 @@ class PhysicalConstants:
     """
     gives you some constants.
     """
-    import numpy as np
 
     c = 299792458.0
     me = 9.109383e-31
diff --git a/postpic/plotting/plotter_matplotlib.py b/postpic/plotting/plotter_matplotlib.py
index d0d5dc46..cb2d43a2 100644
--- a/postpic/plotting/plotter_matplotlib.py
+++ b/postpic/plotting/plotter_matplotlib.py
@@ -21,7 +21,6 @@
 """
 
 import numpy as np
-from .. import _const
 
 
 __all__ = ['MatplotlibPlotter']