diff --git a/src/main.cpp b/src/main.cpp
index 2ba1d4c..fdf5c39 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -148,7 +148,7 @@ void inline lightsleep() {
   PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U,FUNC_GPIO13); // PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U,FUNC_GPIO13);
   gpio_pin_wakeup_enable(GPIO_ID_PIN(GEIGER_PIN), GPIO_PIN_INTR_LOLEVEL);
   wifi_fpm_set_wakeup_cb(fpm_wakup_cb_func1);
-  wifi_fpm_do_sleep((uint32_t)postingInterval*1000); // 0xFFFFFFF: Sleep for longest possible time
+  wifi_fpm_do_sleep(0xFFFFFFF); // Sleep for longest possible time // this does not work: (uint32_t)postingInterval*1000
   //delay(500);
 }