diff --git a/ebuild/deps/__init__.py b/ebuild/deps/__init__.py
index c5f72196..9da9525e 100644
--- a/ebuild/deps/__init__.py
+++ b/ebuild/deps/__init__.py
@@ -23,14 +23,17 @@
 
 DEFAULT_CONFIG = {
     "repos": {
+        # Both repos default to master; neither has a main. Cloning the
+        # branch named here is what `ebuild setup` does first, so "main"
+        # failed it for every new developer before any build ran.
         "eos": {
             "url": DEFAULT_EOS_REPO_URL,
-            "branch": "main",
+            "branch": "master",
             "path": None,
         },
         "eboot": {
             "url": DEFAULT_EBOOT_REPO_URL,
-            "branch": "main",
+            "branch": "master",
             "path": None,
         },
         # §29 ends the development-to-device flow at an eFirmware artifact.