diff --git a/share/man/man4/mem.4 b/share/man/man4/mem.4
index 4d3c1074fc9..6f04970bfbd 100644
--- a/share/man/man4/mem.4
+++ b/share/man/man4/mem.4
@@ -77,7 +77,7 @@ memory.  These attributes can be manipulated via
 calls performed on
 .Nm /dev/mem .
 Declarations and data types are to be found in
-.Pa <memrange.h>
+.Pa <sys/memrange.h>
 .Pp
 The specific attributes, and number of programmable ranges may vary between
 architectures.  The full set of supported attributes is: