diff --git a/linux_gpio2_spi.c b/linux_gpio2_spi.c
index ef162b8..24cf33d 100644
--- a/linux_gpio2_spi.c
+++ b/linux_gpio2_spi.c
@@ -23,6 +23,7 @@
 #include <errno.h>
 #include <gpiod.h>
 #include "programmer.h"
+#include "bitbang_spi.h"
 #include "spi.h"
 #include "flash.h"