diff --git a/cpu/efm32/periph/pm.c b/cpu/efm32/periph/pm.c
index 9c60448cef..10ac8017dc 100644
--- a/cpu/efm32/periph/pm.c
+++ b/cpu/efm32/periph/pm.c
@@ -22,7 +22,7 @@
 
 #include "em_emu.h"
 
-#define ENABLE_DEBUG 0
+#define ENABLE_DEBUG 1
 #include "debug.h"
 
 void pm_set(unsigned mode)
diff --git a/examples/hello-world/Makefile b/examples/hello-world/Makefile
index 258d8e9baf..b002792120 100644
--- a/examples/hello-world/Makefile
+++ b/examples/hello-world/Makefile
@@ -12,6 +12,8 @@ RIOTBASE ?= $(CURDIR)/../..
 # development process:
 DEVELHELP ?= 1
 
+USEMODULE += ztimer_msec ztimer_usec ztimer_ondemand_timer ztimer_ondemand_strict
+
 # Change this to 0 show compiler invocation lines by default:
 QUIET ?= 1
 
diff --git a/examples/hello-world/main.c b/examples/hello-world/main.c
index f51bf8c0a0..2de8077627 100644
--- a/examples/hello-world/main.c
+++ b/examples/hello-world/main.c
@@ -20,6 +20,13 @@
  */
 
 #include <stdio.h>
+#include "ztimer.h"
+
+static void cb(void *arg)
+{
+    (void) arg;
+    puts("Hello again!");
+}
 
 int main(void)
 {
@@ -28,5 +35,12 @@ int main(void)
     printf("You are running RIOT on a(n) %s board.\n", RIOT_BOARD);
     printf("This board features a(n) %s MCU.\n", RIOT_MCU);
 
+    ztimer_t timer = { .callback = cb };
+    ztimer_set(ZTIMER_USEC, &timer, 2000000);
+
+    ztimer_sleep(ZTIMER_MSEC, 10000);
+
+    puts("Bye!");
+
     return 0;
 }