diff --git a/src/MasterLogger.ts b/src/MasterLogger.ts
index d310da4..53a5812 100644
--- a/src/MasterLogger.ts
+++ b/src/MasterLogger.ts
@@ -49,7 +49,7 @@ class MasterLogger implements Logger
     #rotationFreq: number;
     #startDay: number;
     #rotateTO: NodeJS.Timeout;
-    #pruneInterval: NodeJS.Timer;
+    #pruneInterval: NodeJS.Timeout;
     #pruneDays: number;
     #skipFileWrite: boolean;
     #labels: string[];