diff --git a/Modules/Python/CMakeLists.txt b/Modules/Python/CMakeLists.txt
index 03ac79fce6..324265a209 100644
--- a/Modules/Python/CMakeLists.txt
+++ b/Modules/Python/CMakeLists.txt
@@ -1,27 +1,27 @@
 if( MITK_USE_Python )
   if(NOT MITK_USE_SYSTEM_PYTHON)
     add_definitions( -DUSE_MITK_BUILTIN_PYTHON )
   endif()
 
   set(OpenCV_DEP )
   set(SimpleITK_DEP )
   if(MITK_USE_OpenCV)
     set(OpenCV_DEP OpenCV)
   endif()
 
-  if(not APPLE)
+  if(NOT APPLE)
     set(SimpleITK_DEP SimpleITK)
   endif()
 
   MITK_CREATE_MODULE(
     DEPENDS MitkCore
     EXPORT_DEFINE MITK_PYTHON_EXPORT
     PACKAGE_DEPENDS Qt4|QtGui CTK|CTKScriptingPythonCore+CTKScriptingPythonWidgets PythonLibs VTK|vtkPython+vtkWrappingPythonCore ${SimpleITK_DEP} ${OpenCV_DEP}
     INCLUDE_DIRS ${NUMPY_INCLUDE_DIR}
   )
   configure_file(PythonPath.h.in "${CMAKE_CURRENT_BINARY_DIR}/PythonPath.h" @ONLY)
 
   if(NOT APPLE)
     add_subdirectory(Testing)
   endif()
 endif()