diff --git a/platformio.ini b/platformio.ini
index 554960bb..518ee75a 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -32,12 +32,10 @@ halfile = generic.h
 [platformio]
 ; upload firmware to board with usb cable
 default_envs = usb
-
 ; upload firmware to a jfrog bintray repository
 ;default_envs = ota
-
+; use latest versions of libraries
 ;default_envs = dev
-build_cache_dir = /tmp/platformio-shared-cache
 description = Paxcounter is a device for metering passenger flows in realtime. It counts how many mobile devices are around.
 
 [common]
diff --git a/src/timesync.cpp b/src/timesync.cpp
index 35fb8c84..b9656bcc 100644
--- a/src/timesync.cpp
+++ b/src/timesync.cpp
@@ -64,8 +64,7 @@ void process_timesync_req(void *taskparameter) {
 
     // wait until we are joined if we are not
     while (!LMIC.devaddr) {
-      vTaskDelay(3000);
-    }
+      vTaskDelay(pdMS_TO_TICKS(3000));
 
     // collect timestamp samples
     for (uint8_t i = 0; i < TIME_SYNC_SAMPLES; i++) {