diff --git a/src/util/Util.ts b/src/util/Util.ts
index 1691e3b..6b77d55 100644
--- a/src/util/Util.ts
+++ b/src/util/Util.ts
@@ -407,7 +407,7 @@ export const infoToast = (message: string, timeout = 5000) =>
     return immediateToast('info', { message, position: 'topCenter', timeout });
 };
 
-export const resolveTime = (str: string) =>
+export const resolveTime = (str: string): number | null =>
 {
     try
     {