diff --git a/c_src/spi_port.c b/c_src/spi_port.c
index d53670b..d7e83a6 100644
--- a/c_src/spi_port.c
+++ b/c_src/spi_port.c
@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
+#include <asm/ioctl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>