diff --git a/man2/swapon.2 b/man2/swapon.2
index cebeb3cdb..07d5fe86c 100644
--- a/man2/swapon.2
+++ b/man2/swapon.2
@@ -44,7 +44,6 @@
 swapon, swapoff \- start/stop swapping to file/device
 .SH SYNOPSIS
 .nf
-.B #include <unistd.h>
 .B #include <sys/swap.h>
 .PP
 .BI "int swapon(const char *" path ", int " swapflags );