diff --git a/.gitmodules b/.gitmodules
index a945b90796c..f68b57fa809 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -52,3 +52,6 @@
 [submodule "src/dmclock"]
 	path = src/dmclock
 	url = https://github.com/ceph/dmclock.git
+[submodule "src/seastar"]
+	path = src/seastar
+	url = https://github.com/ceph/seastar.git
diff --git a/src/seastar b/src/seastar
new file mode 160000
index 00000000000..9c32e23e722
--- /dev/null
+++ b/src/seastar
@@ -0,0 +1 @@
+Subproject commit 9c32e23e722da580e31462e11c48eba3f6a97a7f