Index: uspace/drv/char/ps2mouse/ps2mouse.c
===================================================================
--- uspace/drv/char/ps2mouse/ps2mouse.c	(revision 56fd7cf53b8ee7af3e78e2237e566926562e0291)
+++ uspace/drv/char/ps2mouse/ps2mouse.c	(revision 48e31904fcd0b717c586d68fd42458d05940cb20)
@@ -75,5 +75,5 @@
 	const ssize_t size = chardev_read(sess, &data, 1); \
 	if (size != 1) { \
-		ddf_msg(LVL_ERROR, "Failed reading byte: %d)", size);\
+		ddf_msg(LVL_ERROR, "Failed reading byte: %zd)", size);\
 		return size < 0 ? size : EIO; \
 	} \