diff --git a/firmware/src/main.c b/firmware/src/main.c
index 311f91e..d76bf27 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -4,7 +4,6 @@
 #include <util/delay.h>
 #include <assert.h>
 #include <stdbool.h>
-#include <string.h>
 
 #define SPI_PORT PORTB
 #define SPI_DDR DDRB
@@ -255,7 +254,7 @@ static void lcd_write_character_page(const char character,
 static void lcd_write_string_page(const char* string,
                                   const uint8_t page,
                                   const bool invert) {
-    for (uint8_t i = 0; i < strlen(string); i++) {
+    for (uint8_t i = 0; string[i] != 0; i++) {
         lcd_write_kerning(2, invert);
         lcd_write_character_page(string[i], page, invert);
     }