diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 5fed243b35f..5b494195dc7 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -57,7 +57,7 @@ ENDMACRO(PY_COMPILE)
 MACRO(PY_2TO3 TARGET_NAME RESOURCE_PATHS)
   ADD_CUSTOM_COMMAND(TARGET ${TARGET_NAME}
     POST_BUILD
-    COMMAND "${CMAKE_SOURCE_DIR}/scripts/2to3" -w ${RESOURCE_PATHS}
+    COMMAND "${PYTHON_EXECUTABLE}" "${CMAKE_SOURCE_DIR}/scripts/2to3" --no-diffs -w ${RESOURCE_PATHS}
     WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
     COMMENT "Porting to Python 3 and Qt5"
   )