diff --git a/tools/build/build.py b/tools/build/build.py
index 7433ceb8..6e837bce 100755
--- a/tools/build/build.py
+++ b/tools/build/build.py
@@ -89,12 +89,12 @@ def build_oxjs(downloads=False, geo=False):
     # Ox.js
     filenames = [
         [
-            'Core.js', # has to run first so that Ox is defined
-            'Fallback.js' # FIXME: not clear if needed here
+            'Core.js' # has to run first so that Ox is defined
         ],
         [
             'Array.js', # Ox.PATH depends on Ox.toArray
             'Collection.js', # Ox.toArray depends on Ox.slice
+            'Fallback.js', # FIXME: not clear if needed here
             'Math.js', # Ox.MAX_LATITUDE depends on Ox.sinh
             'Object.js', # Ox.typeOf depends on Ox.hasOwn
             'Type.js' # Ox.slice may depend on Ox.typeOf