diff --git a/make/py-defs.mk b/make/py-defs.mk
index b0df37e2..08ab51a4 100644
--- a/make/py-defs.mk
+++ b/make/py-defs.mk
@@ -64,7 +64,7 @@ PY_INSTALLED_PY              = $(addprefix $(PY_INSTALL_DIR_PY)/,$(sort $(PY_ALL
 PY_INSTALLED_PYC             = $(addprefix $(PY_INSTALL_DIR_PY)/,$(PY_PYC))
 PY_INSTALLED_REG             = $(PY_INSTALLED_PY) $(PY_INSTALLED_PYC)
 
-PYTHONPATH                  ?= $(call proj_query, pythonpath $(PROJECT))
+PYTHONPATH                  ?= $(call proj_query, pythonpath $(PROJECT) $(PY_PREREQ_RUN))
 #PYTHONPATH                  = $(subst $(space),,$(ENV_PYTHONPATH)$(foreach d,$(PY_MODULE_DIRS),:$(d)))
 export PYTHONPATH