diff --git a/Makefile b/Makefile
index 111a8fee1..28f244400 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ export HTMLTEST_CONFIG ?= .htmltest.yml
 export ALGOLIA_INDEX_FILE ?= $(HUGO_PUBLISH_DIR)/index.algolia.json
 export ALGOLIA_INDEX_NAME ?= dev
 export ALGOLIA_APP_ID ?= docs
-export ALGOLIA_ADMIN_KEY =?
+export ALGOLIA_ADMIN_KEY ?=
 
 export ASCIINEMA_VERSION ?= 2.6.1