diff --git a/.gitmodules b/.gitmodules
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..161d75950cb1be9f3d82f4d0ddb402683fdf0ac0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "src/hashmap"]
+	path = src/hashmap
+	url = git@github.com:fdekeers/hashmap.c.git
diff --git a/src/hashmap b/src/hashmap
new file mode 160000
index 0000000000000000000000000000000000000000..67977d4cd67f86ab6f37a74f21dc7dcdb37e8513
--- /dev/null
+++ b/src/hashmap
@@ -0,0 +1 @@
+Subproject commit 67977d4cd67f86ab6f37a74f21dc7dcdb37e8513