diff --git a/index.js b/index.js
index aed64f0..661b426 100644
--- a/index.js
+++ b/index.js
@@ -57,7 +57,7 @@ function isTodoItem(tokens, index) {
 function todoify(token, TokenConstructor) {
 	token.children.unshift(makeCheckbox(token, TokenConstructor));
 	token.children[1].content = token.children[1].content.slice(3);
-	token.content = token.content.slice(3);
+	token.content = token.content.slice(4);
 
 	if (useLabelWrapper) {
 		if (useLabelAfter) {