diff --git a/lib/libsys/Makefile.sys b/lib/libsys/Makefile.sys
index aa7fd811d2f8..04795445a374 100644
--- a/lib/libsys/Makefile.sys
+++ b/lib/libsys/Makefile.sys
@@ -246,6 +246,7 @@ MAN+=	abort2.2 \
 	listen.2 \
 	lseek.2 \
 	madvise.2 \
+	membarrier.2 \
 	mincore.2 \
 	minherit.2 \
 	mkdir.2 \