diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index 0c62b11f5c..45ccdd1702 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -1309,7 +1309,7 @@ void Planner::check_axes_activity() {
   #endif
 
   #if HAS_TAIL_FAN_SPEED
-    static uint8_t tail_fan_speed[FAN_COUNT];
+    static uint8_t tail_fan_speed[FAN_COUNT] = ARRAY_N_1(FAN_COUNT, 255);
     bool fans_need_update = false;
   #endif