diff --git a/tests/mocs.c b/tests/mocs.c
index 0137e17..057982f 100644
--- a/tests/mocs.c
+++ b/tests/mocs.c
@@ -23,7 +23,7 @@ int tftp_init(struct tftp_context* context) {
     return 0;
 }
 
-void lcd_display_text(uint8_t* text, uint16_t x_pos, uint16_t y_pos, uint32_t color, uint32_t bg_color, sFONT* font) {
+void lcd_display_text(const char* text, uint16_t x_pos, uint16_t y_pos, uint32_t color, uint32_t bg_color, sFONT* font) {
     UNUSED(text);
     UNUSED(x_pos);
     UNUSED(y_pos);
diff --git a/tests/mocs.h b/tests/mocs.h
index 6e0aa5c..c7206d2 100644
--- a/tests/mocs.h
+++ b/tests/mocs.h
@@ -101,7 +101,7 @@ typedef err_t (*tcp_accept_fn)(void* arg, struct tcp_pcb* newpcb, err_t err);
 
 uint32_t logger_get_timestamp(void);
 
-void lcd_display_text(uint8_t* text, uint16_t x_pos, uint16_t y_pos, uint32_t color, uint32_t bg_color, sFONT* font);
+void lcd_display_text(const char* text, uint16_t x_pos, uint16_t y_pos, uint32_t color, uint32_t bg_color, sFONT* font);
 void lcd_draw_img_from_fs(char* filename, uint32_t x_pos, uint32_t y_pos);
 void lcd_draw_gif_from_fs(char* filename, uint32_t x_pos, uint32_t y_pos);
 void lcd_draw_bmp_img(uint8_t* bmp_buff, uint32_t x_pos, uint32_t y_pos);