diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..edf246c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "build/external/hardened_malloc"]
+	path = build/external/hardened_malloc
+	url = https://github.com/GrapheneOS/hardened_malloc
diff --git a/build/external/hardened_malloc b/build/external/hardened_malloc
new file mode 160000
index 0000000..7481c88
--- /dev/null
+++ b/build/external/hardened_malloc
@@ -0,0 +1 @@
+Subproject commit 7481c8857faf5c6ed8666548d9e92837693de91b