diff --git a/etc/ci/upload_nightly.sh b/etc/ci/upload_nightly.sh
index 474bead8abb..8a8128fb9f5 100755
--- a/etc/ci/upload_nightly.sh
+++ b/etc/ci/upload_nightly.sh
@@ -11,7 +11,9 @@ shopt -s failglob
 
 
 usage() {
-    printf "usage: ${0} android|linux|mac|macbrew|windows-gnu|windows-msvc\n"
+    printf \
+        "usage: %s android|linux|mac|macbrew|windows-gnu|windows-msvc\n" \
+        "${0}"
 }
 
 
@@ -52,8 +54,10 @@ update_brew() {
        > "${tmp_dir}/Formula/servo-bin.rb"
 
   git -C "${tmp_dir}" add ./Formula/servo-bin.rb
-  git -C "${tmp_dir}" commit \
-      --author="Tom Servo <servo@servo.org>" \
+  git -C "${tmp_dir}" \
+      -c user.name="Tom Servo" \
+      -c user.email="servo@servo.org" \
+      commit \
       --message="Version bump: ${version}"
 
   git -C "${tmp_dir}" push -qf \