diff --git a/src/cyclic.cpp b/src/cyclic.cpp
index eb3f9a99..51a72671 100644
--- a/src/cyclic.cpp
+++ b/src/cyclic.cpp
@@ -9,7 +9,7 @@ static const char TAG[] = __FILE__;
 
 Ticker housekeeper;
 
-void housekeeping() { xTaskNotify(irqHandlerTask, CYCLIC_IRQ, eSetBits); }
+void housekeeping() { xTaskNotifyFromISR(irqHandlerTask, CYCLIC_IRQ, eSetBits, NULL); }
 
 // do all housekeeping
 void doHousekeeping() {
diff --git a/src/senddata.cpp b/src/senddata.cpp
index 9eb475b9..be84c677 100644
--- a/src/senddata.cpp
+++ b/src/senddata.cpp
@@ -3,7 +3,7 @@
 
 Ticker sendcycler;
 
-void sendcycle() { xTaskNotify(irqHandlerTask, SENDCYCLE_IRQ, eSetBits); }
+void sendcycle() { xTaskNotifyFromISR(irqHandlerTask, SENDCYCLE_IRQ, eSetBits, NULL); }
 
 // put data to send in RTos Queues used for transmit over channels Lora and SPI
 void SendPayload(uint8_t port, sendprio_t prio) {
diff --git a/src/timekeeper.cpp b/src/timekeeper.cpp
index addd7f85..8077693b 100644
--- a/src/timekeeper.cpp
+++ b/src/timekeeper.cpp
@@ -20,7 +20,7 @@ HardwareSerial IF482(2); // use UART #2 (#1 may be in use for serial GPS)
 
 Ticker timesyncer;
 
-void timeSync() { xTaskNotify(irqHandlerTask, TIMESYNC_IRQ, eSetBits); }
+void timeSync() { xTaskNotifyFromISR(irqHandlerTask, TIMESYNC_IRQ, eSetBits, NULL); }
 
 time_t timeProvider(void) {