diff --git a/index.js b/index.js
index 0877a74..b0002cb 100644
--- a/index.js
+++ b/index.js
@@ -58,7 +58,7 @@ module.exports = (
 	// `my_URLstring` → `my_url_string`
 	return decamelized
 		.replace(
-			/(\p{Uppercase_Letter}+)(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu,
+			/(\p{Uppercase_Letter})(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu,
 			replacement
 		)
 		.toLowerCase();