diff --git a/man4/full.4 b/man4/full.4
index 6aeabb396..481dc4644 100644
--- a/man4/full.4
+++ b/man4/full.4
@@ -59,7 +59,7 @@ Seeks on
 .I /dev/full
 will always succeed.
 .SH FILES
-/dev/full
+.I /dev/full
 .SH SEE ALSO
 .BR mknod (1),
 .BR null (4),