diff --git a/.gitmodules b/.gitmodules
index b4c756a67b..e5b8ed316b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -35,3 +35,6 @@
 [submodule "pkcs11-provider"]
 	path = pkcs11-provider
 	url = https://github.com/latchset/pkcs11-provider.git
+[submodule "rpki-client-portable"]
+	path = rpki-client-portable
+	url = https://github.com/rpki-client/rpki-client-portable
diff --git a/rpki-client-portable b/rpki-client-portable
new file mode 160000
index 0000000000..7ccf136e96
--- /dev/null
+++ b/rpki-client-portable
@@ -0,0 +1 @@
+Subproject commit 7ccf136e96dd30189ba4648e3cdeb4d39153d86f