diff --git a/Firmware/language.c b/Firmware/language.c
index 8c1bfc46d..3c168638e 100644
--- a/Firmware/language.c
+++ b/Firmware/language.c
@@ -227,6 +227,7 @@ uint8_t lang_is_selected(void)
 }
 
 #ifdef DEBUG_SEC_LANG
+#include <stdio.h>
 const char* lang_get_sec_lang_str_by_id(uint16_t id)
 {
 	uint16_t ui = _SEC_LANG_TABLE; //table pointer