diff --git a/man2/mmap.2 b/man2/mmap.2
index 4ee2f4f96..96b7444b0 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2
@@ -254,7 +254,7 @@ restrictions.
 If the memory region specified by
 .I addr
 and
-.I len
+.I length
 overlaps pages of any existing mapping(s), then the overlapped
 part of the existing mapping(s) will be discarded.
 If the specified address cannot be used,