diff --git a/src/misc/ioctl.c b/src/misc/ioctl.c
index 49282811..6d3e5095 100644
--- a/src/misc/ioctl.c
+++ b/src/misc/ioctl.c
@@ -6,6 +6,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
+#include <endian.h>
 #include "syscall.h"
 
 #define alignof(t) offsetof(struct { char c; t x; }, x)
@@ -90,7 +91,14 @@ static void convert_ioctl_struct(const struct ioctl_compat_map *map, char *old,
 		 * if another exception appears this needs changing. */
 		convert_ioctl_struct(map+1, old, new, dir);
 		convert_ioctl_struct(map+2, old+4, new+8, dir);
-		convert_ioctl_struct(map+3, old+68, new+72, dir);
+		int adj = BYTE_ORDER==BIG_ENDIAN ? 4 : 0;
+		if (dir==W) {
+			memcpy(old+68, new+72+adj, 4);
+			memcpy(old+72, new+72+4+2*adj, 4);
+		} else {
+			memcpy(new+72+adj, old+68, 4);
+			memcpy(new+72+4+2*adj, old+72, 4);
+		}
 		return;
 	}
 	for (int i=0; i < map->noffs; i++) {