diff --git a/netlify.toml b/netlify.toml
index 63b4e1bd77..b77ede80b8 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -103,7 +103,14 @@ status = 200
 command = "npm run build:nuxt"
 
 [context.branch-deploy]
+# A pull request already gets a deploy preview for every commit, so a branch
+# deploy of the same commit builds the site twice and takes a slot from the
+# three concurrent builds Netlify gives us. Skip it. The command stays so that
+# a branch deploy, should the ignore ever stop skipping, still builds Nuxt
+# only, rather than falling through to the root [build] command, which also
+# runs index:algolia and would write the search index from a branch.
 command = "npm run build:nuxt"
+ignore = "exit 0"
 
 [[plugins]]
 package = "netlify-plugin-cache"