diff --git a/Makefile b/Makefile
index 8fd431900..cff1068c0 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,8 @@ all: fmt gen lint build test
 
 .PHONY: fmt
 fmt:
-	prefix "$@" ./ci/sub/bin/fmt.sh
+	# Unset GITHUB_TOKEN, see https://github.com/terrastruct/d2/commit/335d925b7c937d4e7cac7e26de993f60840eb116#commitcomment-98101131
+	GITHUB_TOKEN= prefix "$@" ./ci/sub/bin/fmt.sh
 .PHONY: gen
 gen:
 	prefix "$@" ./ci/gen.sh