diff --git a/sys/test_utils/print_stack_usage/print_stack_usage.c b/sys/test_utils/print_stack_usage/print_stack_usage.c
index c168b9c1bc..3514b6039c 100644
--- a/sys/test_utils/print_stack_usage/print_stack_usage.c
+++ b/sys/test_utils/print_stack_usage/print_stack_usage.c
@@ -22,6 +22,8 @@
 
 #if MODULE_FMT
 #include "fmt.h"
+#else
+#include <stdio.h>
 #endif
 
 #if MODULE_FMT