diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3ecfe23a6..35d280d68 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -445,7 +445,7 @@ if(NOT FREECAD_LIBPACK_USE OR FREECAD_LIBPACK_CHECKFILE_CLBUNDLER)
 
 # http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=677598
 # Acceptable versions of Python
-set(Python_ADDITIONAL_VERSIONS "2.7")
+set(Python_ADDITIONAL_VERSIONS "3.6")
 
 # For building on OS X
 if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")