diff --git a/man2/madvise.2 b/man2/madvise.2
index 077c4e93e..6ce4c93ef 100644
--- a/man2/madvise.2
+++ b/man2/madvise.2
@@ -178,7 +178,7 @@ it is only available if the kernel was configured with
 Enable Kernel Samepage Merging (KSM) for the pages in the range specified by
 .I addr
 and
-.IR len .
+.IR length .
 The kernel regularly scans those areas of user memory that have
 been marked as mergeable,
 looking for pages with identical content.