diff --git a/src/systemcmds/tests/test_int.c b/src/systemcmds/tests/test_int.c
index f19eff3d84..01092aa2d4 100644
--- a/src/systemcmds/tests/test_int.c
+++ b/src/systemcmds/tests/test_int.c
@@ -36,6 +36,9 @@
  * Included Files
  ****************************************************************************/
 
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
 #include <px4_config.h>
 #include <px4_defines.h>