diff --git a/examples/RF69/RF69_Receive_Interrupt/RF69_Receive_Interrupt.ino b/examples/RF69/RF69_Receive_Interrupt/RF69_Receive_Interrupt.ino
index 12d5de5d..da520351 100644
--- a/examples/RF69/RF69_Receive_Interrupt/RF69_Receive_Interrupt.ino
+++ b/examples/RF69/RF69_Receive_Interrupt/RF69_Receive_Interrupt.ino
@@ -74,6 +74,9 @@ volatile bool enableInterrupt = true;
 // is received by the module
 // IMPORTANT: this function MUST be 'void' type
 //            and MUST NOT have any arguments!
+#if defined(ESP8266) || defined(ESP32)
+  ICACHE_RAM_ATTR
+#endif
 void setFlag(void) {
   // check if the interrupt is enabled
   if(!enableInterrupt) {
diff --git a/examples/RF69/RF69_Transmit_Interrupt/RF69_Transmit_Interrupt.ino b/examples/RF69/RF69_Transmit_Interrupt/RF69_Transmit_Interrupt.ino
index eb54a541..6ae3fa1c 100644
--- a/examples/RF69/RF69_Transmit_Interrupt/RF69_Transmit_Interrupt.ino
+++ b/examples/RF69/RF69_Transmit_Interrupt/RF69_Transmit_Interrupt.ino
@@ -91,6 +91,9 @@ volatile bool enableInterrupt = true;
 // is transmitted by the module
 // IMPORTANT: this function MUST be 'void' type
 //            and MUST NOT have any arguments!
+#if defined(ESP8266) || defined(ESP32)
+  ICACHE_RAM_ATTR
+#endif
 void setFlag(void) {
   // check if the interrupt is enabled
   if(!enableInterrupt) {