diff --git a/platform/embedded/hci_dump_segger_rtt_binary.c b/platform/embedded/hci_dump_segger_rtt_binary.c
index 7cd26b033..eab20a536 100644
--- a/platform/embedded/hci_dump_segger_rtt_binary.c
+++ b/platform/embedded/hci_dump_segger_rtt_binary.c
@@ -49,6 +49,8 @@
 
 #include "SEGGER_RTT.h"
 
+#include <stdio.h>  // vsnprintf
+
 // allow to configure mode, channel, up buffer size in btstack_config.h
 #ifndef SEGGER_RTT_PACKETLOG_MODE
 #define SEGGER_RTT_PACKETLOG_MODE SEGGER_RTT_MODE_DEFAULT
diff --git a/port/nrf5-cinnamon/port/hal_timer_nrf5.c b/port/nrf5-cinnamon/port/hal_timer_nrf5.c
index 2c06f5066..3d9772e6d 100644
--- a/port/nrf5-cinnamon/port/hal_timer_nrf5.c
+++ b/port/nrf5-cinnamon/port/hal_timer_nrf5.c
@@ -43,6 +43,8 @@
  *  @note Only uses one of multiple RTCs and only a single Capture-Compare unit
  */
 
+#include <stddef.h>
+
 #include "hal_timer.h"
 #include "btstack_debug.h"
 
diff --git a/port/nrf5-cinnamon/port/ll_nrf5.c b/port/nrf5-cinnamon/port/ll_nrf5.c
index 24f49bdfb..3176be953 100644
--- a/port/nrf5-cinnamon/port/ll_nrf5.c
+++ b/port/nrf5-cinnamon/port/ll_nrf5.c
@@ -41,6 +41,7 @@
 
 #include <string.h>
 #include <inttypes.h>
+#include <stdio.h>
 
 #include "ll.h"