diff --git a/cmake/catkin_package_xml.cmake b/cmake/catkin_package_xml.cmake
index 8c7c026ad..99dc212ad 100644
--- a/cmake/catkin_package_xml.cmake
+++ b/cmake/catkin_package_xml.cmake
@@ -60,7 +60,7 @@ macro(_catkin_package_xml dest_dir)
   # stamp and parse package.xml
   stamp(${_PACKAGE_XML_DIRECTORY}/package.xml)
   file(MAKE_DIRECTORY ${dest_dir})
-  safe_execute_process(COMMAND
+  safe_execute_process(COMMAND ${PYTHON_EXECUTABLE}
     ${catkin_EXTRAS_DIR}/parse_package_xml.py
     ${_PACKAGE_XML_DIRECTORY}/package.xml
     ${dest_dir}/package.cmake)
diff --git a/cmake/catkin_python_setup.cmake b/cmake/catkin_python_setup.cmake
index dfea73bd1..2a8a0f755 100644
--- a/cmake/catkin_python_setup.cmake
+++ b/cmake/catkin_python_setup.cmake
@@ -59,7 +59,7 @@ function(catkin_python_setup)
   assert(CATKIN_ENV)
   assert(PYTHON_EXECUTABLE)
   set(cmd
-    ${CATKIN_ENV}
+    ${CATKIN_ENV} ${PYTHON_EXECUTABLE}
     ${catkin_EXTRAS_DIR}/interrogate_setup_dot_py.py
     ${PROJECT_NAME}
     ${${PROJECT_NAME}_SOURCE_DIR}/setup.py
diff --git a/cmake/interrogate_setup_dot_py.py b/cmake/interrogate_setup_dot_py.py
old mode 100755
new mode 100644
diff --git a/cmake/list_insert_in_workspace_order.cmake b/cmake/list_insert_in_workspace_order.cmake
index 53745802f..57ade4a49 100644
--- a/cmake/list_insert_in_workspace_order.cmake
+++ b/cmake/list_insert_in_workspace_order.cmake
@@ -19,7 +19,7 @@ macro(list_insert_in_workspace_order listname)
     assert(CATKIN_ENV)
     assert(PYTHON_EXECUTABLE)
     set(cmd
-      ${CATKIN_ENV}
+      ${CATKIN_ENV} ${PYTHON_EXECUTABLE}
       ${catkin_EXTRAS_DIR}/order_paths.py
       ${${PROJECT_NAME}_BINARY_DIR}/catkin_generated/ordered_paths.cmake
       --paths-to-order ${ARGN}
diff --git a/cmake/order_paths.py b/cmake/order_paths.py
old mode 100755
new mode 100644
diff --git a/cmake/python.cmake b/cmake/python.cmake
index 122ce8f44..6a7617ec5 100644
--- a/cmake/python.cmake
+++ b/cmake/python.cmake
@@ -1,7 +1,7 @@
 # the CMake variable PYTHON_INSTALL_DIR has the same value as the Python function catkin.builder.get_python_install_dir()
 
 find_package(PythonInterp REQUIRED)
-execute_process(COMMAND ${catkin_EXTRAS_DIR}/python_version.py
+execute_process(COMMAND ${PYTHON_EXECUTABLE} ${catkin_EXTRAS_DIR}/python_version.py
   OUTPUT_VARIABLE PYTHON_VERSION_XDOTY
   OUTPUT_STRIP_TRAILING_WHITESPACE)
 
diff --git a/cmake/python_version.py b/cmake/python_version.py
old mode 100755
new mode 100644