diff --git a/cores/esp8266/Schedule.cpp b/cores/esp8266/Schedule.cpp
index 60d87e863..0f78f943e 100644
--- a/cores/esp8266/Schedule.cpp
+++ b/cores/esp8266/Schedule.cpp
@@ -14,9 +14,9 @@ static scheduled_fn_t* sLastUnused = 0;
 
 static int sCount = 0;
 
+static void init_lists() __attribute__((unused));
 static void init_lists()
 {
-    (void) init_lists;
     if (sCount != 0) {
         return;
     }