diff --git a/Makefile.pre.in b/Makefile.pre.in
index 1451cf3a31ff02..cacf14a52cb68e 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2356,6 +2356,11 @@ TESTSUBDIRS=	idlelib/idle_test \
 		test/test_importlib/import_ \
 		test/test_importlib/metadata \
 		test/test_importlib/metadata/data \
+		test/test_importlib/metadata/data/sources \
+		test/test_importlib/metadata/data/sources/example \
+		test/test_importlib/metadata/data/sources/example/example \
+		test/test_importlib/metadata/data/sources/example2 \
+		test/test_importlib/metadata/data/sources/example2/example2 \
 		test/test_importlib/namespace_pkgs \
 		test/test_importlib/namespace_pkgs/both_portions \
 		test/test_importlib/namespace_pkgs/both_portions/foo \