diff --git a/src/WorkerThread.cpp b/src/WorkerThread.cpp
index ed1103911..f84d83be2 100644
--- a/src/WorkerThread.cpp
+++ b/src/WorkerThread.cpp
@@ -28,13 +28,7 @@ void NotifiedWorkerThread::notify(uint32_t v, eNotifyAction action)
     xTaskNotify(taskHandle, v, action);
 }
 
-/**
- * Notify from an ISR
- */
-void NotifiedWorkerThread::notifyFromISR(BaseType_t *highPriWoken, uint32_t v, eNotifyAction action)
-{
-    xTaskNotifyFromISR(taskHandle, v, action, highPriWoken);
-}
+
 
 void NotifiedWorkerThread::block()
 {
diff --git a/src/WorkerThread.h b/src/WorkerThread.h
index f951da32c..86ec08e13 100644
--- a/src/WorkerThread.h
+++ b/src/WorkerThread.h
@@ -61,8 +61,13 @@ class NotifiedWorkerThread : public WorkerThread
 
     /**
      * Notify from an ISR
+     *
+     * This must be inline or IRAM_ATTR on ESP32
      */
-    void notifyFromISR(BaseType_t *highPriWoken, uint32_t v = 0, eNotifyAction action = eNoAction);
+    inline void notifyFromISR(BaseType_t *highPriWoken, uint32_t v = 0, eNotifyAction action = eNoAction)
+    {
+        xTaskNotifyFromISR(taskHandle, v, action, highPriWoken);
+    }
 
   protected:
     /**