diff --git a/Makefile b/Makefile
index 8b896bf10..cfb327737 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # All documents to be used in spell check.
-ALL_DOCS := $(shell find . -name '*.md' -not -path './.github/*' -type f | grep -v ^./node_modules | sort)
+ALL_DOCS := $(shell find . -type f -name '*.md' -not -path './.github/*' -not -path './node_modules/*' | sort)
 PWD := $(shell pwd)
 
 TOOLS_DIR := ./internal/tools