diff --git a/.gitmodules b/.gitmodules
index 9906b7f0c4bab79cd21192e95a6bed1255825c8d..1a5de29f88eca0aaa7d65adb29f3c91a350abe6e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "external/pybind11"]
 	path = external/pybind11
 	url = https://github.com/pybind/pybind11.git
+[submodule "external/schaapcommon"]
+	path = external/schaapcommon
+	url = https://git.astron.nl/RD/schaapcommon.git
diff --git a/external/schaapcommon b/external/schaapcommon
new file mode 160000
index 0000000000000000000000000000000000000000..351d9536bf8a35cb7eff93892fc5b1ca725ebda7
--- /dev/null
+++ b/external/schaapcommon
@@ -0,0 +1 @@
+Subproject commit 351d9536bf8a35cb7eff93892fc5b1ca725ebda7