diff --git a/makefiles/Makefile.python.mk b/makefiles/Makefile.python.mk
index dea1513c3e..3b531ae086 100755
--- a/makefiles/Makefile.python.mk
+++ b/makefiles/Makefile.python.mk
@@ -249,7 +249,7 @@ endif
 
 PYPI_ARCHIVE_TEMP_DIR = temp-python$(PYTHON_VERSION)
 
-OR_TOOLS_PYTHON_GEN_SCRIPTS = $(wildcard src/gen/ortools/*/*)
+OR_TOOLS_PYTHON_GEN_SCRIPTS = $(wildcard src/gen/ortools/*/*.py) $(wildcard src/gen/ortools/*/*.cc)
 
 pypi_archive: python $(PYPI_ARCHIVE_TEMP_DIR)