diff --git a/src/pages/tools/string/statistic/types.ts b/src/pages/tools/string/statistic/types.ts
index 7dfe089..c775910 100644
--- a/src/pages/tools/string/statistic/types.ts
+++ b/src/pages/tools/string/statistic/types.ts
@@ -1,6 +1,6 @@
 export type InitialValuesType = {
   emptyLines: boolean;
-  sentenceDelimiters?: string[];
+  sentenceDelimiters: string;
   wordDelimiters: string;
   characterCount: boolean;
   wordCount: boolean;