diff --git a/Code/Mantid/MantidPlot/CMakeLists.txt b/Code/Mantid/MantidPlot/CMakeLists.txt
index 2fe8e8f0975e8af4ca270cc06e17ec33c955665d..79fb403a0cb569df29d97a45fc592d650baf222f 100644
--- a/Code/Mantid/MantidPlot/CMakeLists.txt
+++ b/Code/Mantid/MantidPlot/CMakeLists.txt
@@ -456,6 +456,7 @@ include ( UseSystemQt4 )
 # Do the sip generation.
 ###########################################################################
 
+include_directories ( ${PYTHON_INCLUDE_PATH} )
 find_package ( PyQt4 REQUIRED )
 find_package ( SIP REQUIRED )
 separate_arguments ( PYQT4_SIP_FLAGS )
diff --git a/Code/Mantid/MantidQt/CMakeLists.txt b/Code/Mantid/MantidQt/CMakeLists.txt
index 3951190d743500f4956040412f430657ca8b039c..2a40f566a9ca85b7475cf3f7363b5a6faf7d1b17 100644
--- a/Code/Mantid/MantidQt/CMakeLists.txt
+++ b/Code/Mantid/MantidQt/CMakeLists.txt
@@ -52,6 +52,7 @@ endif ()
 # Do the sip generation, for python bindings
 ###########################################################################
 
+include_directories ( ${PYTHON_INCLUDE_PATH} )
 find_package ( PyQt4 REQUIRED )
 find_package ( SIP REQUIRED )
 separate_arguments ( PYQT4_SIP_FLAGS )