diff --git a/make/py-defs.mk b/make/py-defs.mk
index 417231c4..9d3f9ef7 100644
--- a/make/py-defs.mk
+++ b/make/py-defs.mk
@@ -25,7 +25,7 @@ ifndef PY_PREREQ_BUILD_DIRS
   PY_PREREQ_BUILD_DIRS      := $(shell $(proj_query_cmd) proj-dir $(PY_PREREQ_BUILD))
 endif
 
-PY_MYPY                     ?= mypy --ignore-missing-imports
+PY_MYPY                     ?= mypy --ignore-missing-imports --no-namespace-packages
 
 PY_SRC_PY                   ?= $(wildcard *.py)
 PY_ALL_PY                    = $(PY_SRC_PY)