diff --git a/unix/mkall.sh b/unix/mkall.sh
index 0b2a7a7..76f9cdd 100755
--- a/unix/mkall.sh
+++ b/unix/mkall.sh
@@ -99,31 +99,31 @@
 dragonfly_amd64)
 	mkerrors="$mkerrors -m64"
 	mksyscall="go run mksyscall.go -dragonfly"
-	mksysnum="go run mksysnum.go 'http://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/sys/kern/syscalls.master'"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 freebsd_386)
 	mkerrors="$mkerrors -m32"
 	mksyscall="go run mksyscall.go -l32"
-	mksysnum="go run mksysnum.go 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 freebsd_amd64)
 	mkerrors="$mkerrors -m64"
-	mksysnum="go run mksysnum.go 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 freebsd_arm)
 	mkerrors="$mkerrors"
 	mksyscall="go run mksyscall.go -l32 -arm"
-	mksysnum="go run mksysnum.go 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
 	# Let the type of C char be signed for making the bare syscall
 	# API consistent across platforms.
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
 	;;
 freebsd_arm64)
 	mkerrors="$mkerrors -m64"
-	mksysnum="go run mksysnum.go 'http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master'"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 netbsd_386)
@@ -150,21 +150,21 @@
 	mkerrors="$mkerrors -m32"
 	mksyscall="go run mksyscall.go -l32 -openbsd"
 	mksysctl="./mksysctl_openbsd.pl"
-	mksysnum="go run mksysnum.go 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 openbsd_amd64)
 	mkerrors="$mkerrors -m64"
 	mksyscall="go run mksyscall.go -openbsd"
 	mksysctl="./mksysctl_openbsd.pl"
-	mksysnum="go run mksysnum.go 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs"
 	;;
 openbsd_arm)
 	mkerrors="$mkerrors"
 	mksyscall="go run mksyscall.go -l32 -openbsd -arm"
 	mksysctl="./mksysctl_openbsd.pl"
-	mksysnum="go run mksysnum.go 'http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
+	mksysnum="go run mksysnum.go 'https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master'"
 	# Let the type of C char be signed for making the bare syscall
 	# API consistent across platforms.
 	mktypes="GOARCH=$GOARCH go tool cgo -godefs -- -fsigned-char"
diff --git a/unix/mksysnum.go b/unix/mksysnum.go
index 45b6e75..07f8960 100644
--- a/unix/mksysnum.go
+++ b/unix/mksysnum.go
@@ -106,7 +106,7 @@
 
 	file := strings.TrimSpace(os.Args[1])
 	var syscalls io.Reader
-	if strings.HasPrefix(file, "http://") {
+	if strings.HasPrefix(file, "https://") || strings.HasPrefix(file, "http://") {
 		// Download syscalls.master file
 		syscalls = fetchFile(file)
 	} else {
diff --git a/unix/zsysnum_dragonfly_amd64.go b/unix/zsysnum_dragonfly_amd64.go
index ff3976e..464c9a9 100644
--- a/unix/zsysnum_dragonfly_amd64.go
+++ b/unix/zsysnum_dragonfly_amd64.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/sys/kern/syscalls.master
+// go run mksysnum.go https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build amd64,dragonfly
diff --git a/unix/zsysnum_freebsd_386.go b/unix/zsysnum_freebsd_386.go
index b1e81b7..55c3a32 100644
--- a/unix/zsysnum_freebsd_386.go
+++ b/unix/zsysnum_freebsd_386.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master
+// go run mksysnum.go https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build 386,freebsd
diff --git a/unix/zsysnum_freebsd_amd64.go b/unix/zsysnum_freebsd_amd64.go
index 73e277f..b39be6c 100644
--- a/unix/zsysnum_freebsd_amd64.go
+++ b/unix/zsysnum_freebsd_amd64.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master
+// go run mksysnum.go https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build amd64,freebsd
diff --git a/unix/zsysnum_freebsd_arm.go b/unix/zsysnum_freebsd_arm.go
index e12b469..44ffd4c 100644
--- a/unix/zsysnum_freebsd_arm.go
+++ b/unix/zsysnum_freebsd_arm.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master
+// go run mksysnum.go https://svn.freebsd.org/base/stable/10/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build arm,freebsd
diff --git a/unix/zsysnum_openbsd_386.go b/unix/zsysnum_openbsd_386.go
index d5bf3c4..b0207d1 100644
--- a/unix/zsysnum_openbsd_386.go
+++ b/unix/zsysnum_openbsd_386.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master
+// go run mksysnum.go https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build 386,openbsd
diff --git a/unix/zsysnum_openbsd_amd64.go b/unix/zsysnum_openbsd_amd64.go
index cbcfdfb..f0dec6f 100644
--- a/unix/zsysnum_openbsd_amd64.go
+++ b/unix/zsysnum_openbsd_amd64.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master
+// go run mksysnum.go https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build amd64,openbsd
diff --git a/unix/zsysnum_openbsd_arm.go b/unix/zsysnum_openbsd_arm.go
index a84cead..33d1dc5 100644
--- a/unix/zsysnum_openbsd_arm.go
+++ b/unix/zsysnum_openbsd_arm.go
@@ -1,4 +1,4 @@
-// go run mksysnum.go http://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master
+// go run mksysnum.go https://cvsweb.openbsd.org/cgi-bin/cvsweb/~checkout~/src/sys/kern/syscalls.master
 // Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build arm,openbsd