diff --git a/source/shell.c b/source/shell.c
index ef8bb1f..6335f4e 100644
--- a/source/shell.c
+++ b/source/shell.c
@@ -1,7 +1,5 @@
-#define _GNU_SOURCE
-#include <libopencm3/stm32/spi.h>
-
 #include <ctype.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>