diff --git a/keyboards/helix/rev3_4rows/keymaps/via/oled_display.c b/keyboards/helix/rev3_4rows/keymaps/via/oled_display.c
index e951f627..ee5277a7 100644
--- a/keyboards/helix/rev3_4rows/keymaps/via/oled_display.c
+++ b/keyboards/helix/rev3_4rows/keymaps/via/oled_display.c
@@ -16,6 +16,8 @@
 
 #include QMK_KEYBOARD_H
 
+#include <stdio.h>
+
 // Defines names for use in layer keycodes and the keymap
 enum layer_names {
   _QWERTY = 0,
diff --git a/keyboards/helix/rev3_5rows/keymaps/via/oled_display.c b/keyboards/helix/rev3_5rows/keymaps/via/oled_display.c
index e951f627..ee5277a7 100644
--- a/keyboards/helix/rev3_5rows/keymaps/via/oled_display.c
+++ b/keyboards/helix/rev3_5rows/keymaps/via/oled_display.c
@@ -16,6 +16,8 @@
 
 #include QMK_KEYBOARD_H
 
+#include <stdio.h>
+
 // Defines names for use in layer keycodes and the keymap
 enum layer_names {
   _QWERTY = 0,