diff --git a/examples/DFRobotAS3935LightningSensorDetailed/DFRobotAS3935LightningSensorDetailed.ino b/examples/DFRobotAS3935LightningSensorDetailed/DFRobotAS3935LightningSensorDetailed.ino
index 40b141a..c3d7f84 100644
--- a/examples/DFRobotAS3935LightningSensorDetailed/DFRobotAS3935LightningSensorDetailed.ino
+++ b/examples/DFRobotAS3935LightningSensorDetailed/DFRobotAS3935LightningSensorDetailed.ino
@@ -128,7 +128,7 @@ void loop()
 }
 
 //IRQ handler for AS3935 interrupts
-void AS3935_ISR()
+void IRAM_ATTR AS3935_ISR()
 {
   AS3935IsrTrig = 1;
 }