diff --git a/sys/xtimer/xtimer.c b/sys/xtimer/xtimer.c
index 985be1408c..1c11d77c0e 100644
--- a/sys/xtimer/xtimer.c
+++ b/sys/xtimer/xtimer.c
@@ -23,6 +23,7 @@
 #include <string.h>
 
 #include "xtimer.h"
+#include "msg.h"
 #include "mutex.h"
 #include "rmutex.h"
 #include "thread.h"
diff --git a/sys/ztimer/convert.c b/sys/ztimer/convert.c
index 974b95ebab..19232f4016 100644
--- a/sys/ztimer/convert.c
+++ b/sys/ztimer/convert.c
@@ -21,6 +21,7 @@
  */
 
 #include <stdio.h>
+#include <inttypes.h>
 
 #include "ztimer/convert.h"
 
diff --git a/sys/ztimer/convert_frac.c b/sys/ztimer/convert_frac.c
index 31e2bcd68a..a5f0224569 100644
--- a/sys/ztimer/convert_frac.c
+++ b/sys/ztimer/convert_frac.c
@@ -23,6 +23,7 @@
  */
 
 #include <stdint.h>
+#include <inttypes.h>
 
 #include "frac.h"
 #include "assert.h"
diff --git a/sys/ztimer/convert_shift.c b/sys/ztimer/convert_shift.c
index 8cae834d08..a099a103a9 100644
--- a/sys/ztimer/convert_shift.c
+++ b/sys/ztimer/convert_shift.c
@@ -21,6 +21,7 @@
  */
 
 #include <stdio.h>
+#include <inttypes.h>
 
 #include "ztimer/convert.h"
 #include "ztimer/convert_shift.h"
diff --git a/sys/ztimer/core.c b/sys/ztimer/core.c
index ccc75da727..7c7fbc3e46 100644
--- a/sys/ztimer/core.c
+++ b/sys/ztimer/core.c
@@ -24,6 +24,7 @@
  */
 #include <assert.h>
 #include <stdint.h>
+#include <inttypes.h>
 
 #include "kernel_defines.h"
 #include "irq.h"