diff --git a/.gitmodules b/.gitmodules
index 4cca9a4a8..49ec16134 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,7 +1,7 @@
 [submodule "test/data"]
 	path = test/data
 	url = https://github.com/mapnik/test-data.git
-	branch = master
+	branch = large_csv
 [submodule "test/data-visual"]
 	path = test/data-visual
 	url = https://github.com/mapnik/test-data-visual.git
diff --git a/test/data b/test/data
index 3b1f481ac..8168048ec 160000
--- a/test/data
+++ b/test/data
@@ -1 +1 @@
-Subproject commit 3b1f481ac2ceeb780255cd4c76a42ae06197b9bc
+Subproject commit 8168048ec719219f154cde0a8bc7517264828324