diff --git a/alchitry-loader/src/spi.h b/alchitry-loader/src/spi.h
index d2a38a2..10631ca 100644
--- a/alchitry-loader/src/spi.h
+++ b/alchitry-loader/src/spi.h
@@ -9,6 +9,7 @@
 #define SPI_H_
 
 #include "ftd2xx.h"
+#include <cstdint>
 #include <unistd.h>
 #include <string>