diff --git a/src/ThreadedGSM.h b/src/ThreadedGSM.h
index badf514..95fc3aa 100644
--- a/src/ThreadedGSM.h
+++ b/src/ThreadedGSM.h
@@ -401,7 +401,7 @@ class ThreadedGSM {
     }
 
     // Threads
-    void Clock(void)
+    void Clock()
     {
         String clockTime;
         int lastState = state;