diff --git a/.gitmodules b/.gitmodules
index 16034e9c..3c408071 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -16,3 +16,6 @@
 [submodule "lib/addon-sdk-1.2"]
 	path = lib/addon-sdk-1.2
 	url = git://github.com/mozilla/addon-sdk.git
+[submodule "lib/addon-sdk-1.2.1"]
+	path = lib/addon-sdk-1.2.1
+	url = git://github.com/mozilla/addon-sdk.git
diff --git a/lib/addon-sdk-1.2.1 b/lib/addon-sdk-1.2.1
new file mode 160000
index 00000000..bc79d543
--- /dev/null
+++ b/lib/addon-sdk-1.2.1
@@ -0,0 +1 @@
+Subproject commit bc79d543987f6fa595d7c490f52ec29333f7352d