diff --git a/src/mini_printf.c b/src/mini_printf.c
index 57ae3e58b068..c5b1e09bdc56 100644
--- a/src/mini_printf.c
+++ b/src/mini_printf.c
@@ -37,6 +37,7 @@
 #include "gba/defines.h"
 #include "config/general.h"
 #include "constants/characters.h"
+#include "string_util.h"
 
 #ifndef NDEBUG