diff --git a/src/modules/systemlib/err.c b/src/modules/systemlib/err.c
index 0011bca206..b7b6f0a9c3 100644
--- a/src/modules/systemlib/err.c
+++ b/src/modules/systemlib/err.c
@@ -40,6 +40,9 @@
 
 #include <px4_config.h>
 
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>