diff --git a/package-overrides/github/SheetJS/js-xls@0.7.2.json b/package-overrides/github/SheetJS/js-xls@0.7.2.json
new file mode 100644
index 0000000..8d6df80
--- /dev/null
+++ b/package-overrides/github/SheetJS/js-xls@0.7.2.json
@@ -0,0 +1,3 @@
+{
+  "format": "global"
+}
diff --git a/package-overrides/github/SheetJS/js-xlsx@0.7.12.json b/package-overrides/github/SheetJS/js-xlsx@0.7.12.json
new file mode 100644
index 0000000..8d6df80
--- /dev/null
+++ b/package-overrides/github/SheetJS/js-xlsx@0.7.12.json
@@ -0,0 +1,3 @@
+{
+  "format": "global"
+}
diff --git a/registry.json b/registry.json
index 5687cd0..9eb958a 100644
--- a/registry.json
+++ b/registry.json
@@ -97,5 +97,7 @@
   "underscore": "npm:underscore",
   "webfont": "github:components/webfontloader",
   "when": "github:cujojs/when",
-  "wire": "github:cujojs/wire"
+  "wire": "github:cujojs/wire",
+  "xlsjs": "github:SheetJS/js-xls",
+  "xlsx": "github:SheetJS/js-xlsx"
 }