diff --git a/make/py-defs.mk b/make/py-defs.mk
index f2c58ec2..374c2575 100644
--- a/make/py-defs.mk
+++ b/make/py-defs.mk
@@ -35,6 +35,8 @@ PYTHONPATH           ?= $(call proj_query, pythonpath $(PROJECT))
 #PYTHONPATH            = $(subst $(space),,$(ENV_PYTHONPATH)$(foreach d,$(PY_MODULE_DIRS),:$(d)))
 export PYTHONPATH
 
+PY_DEFS_MK_INCLUDED := true
+ifneq ($(PY_DEFS_MK_INCLUDED),true)
 all:
 clean: pyc.clean
 
@@ -53,6 +55,6 @@ pyc.clean:
 libpath: py-libpath
 py-libpath:
 	@echo export PYTHONPATH=$(PYTHONPATH)
+endif
 
 include $(MODDIR)/make/ldlibpath.mk
-