diff --git a/src/add-ons/accelerants/atimach64/InitAccelerant.c b/src/add-ons/accelerants/atimach64/InitAccelerant.c
index f48dd84db5..f94cccbe5d 100644
--- a/src/add-ons/accelerants/atimach64/InitAccelerant.c
+++ b/src/add-ons/accelerants/atimach64/InitAccelerant.c
@@ -8,6 +8,7 @@
 #include "sys/stat.h"
 #include "fcntl.h"
 #include <sys/ioctl.h>
+#include <errno.h>
 #include "stdio.h"
 
 /* defined in ProposeDisplayMode.c */