diff --git a/configure.ac b/configure.ac
index 12a6e65e..52f8ad44 100644
--- a/configure.ac
+++ b/configure.ac
@@ -282,6 +282,7 @@ esac
 
 AM_CONDITIONAL([CYGWIN], test "x$host_os_cygwin" = "xyes")
 AM_CONDITIONAL([DARWIN], test "x$host_os_darwin" = "xyes")
+AC_PATH_PROGS([DUPATH], [du], [du], [/usr/bin$PATH_SEPARATOR/bin] )
 AC_SUBST(SIZECMD)
 AC_SUBST(SEDINPLACE)
 AC_SUBST(STRIP_BINARIES)
diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 727de258..328fbff2 100644
--- a/scripts/Makefile.am
+++ b/scripts/Makefile.am
@@ -53,6 +53,7 @@ edit = sed \
 	-e 's|@BUILDSCRIPT[@]|$(BUILDSCRIPT)|g' \
 	-e 's|@SIZECMD[@]|$(SIZECMD)|g' \
 	-e 's|@SEDINPLACE[@]|$(SEDINPLACE)|g' \
+	-e 's|@DUPATH[@]|$(DUPATH)|g' \
 	-e 's|@SCRIPTNAME[@]|$@|g' \
 	-e 's|@configure_input[@]|Generated from $@.sh.in; do not edit by hand.|g'
 
diff --git a/scripts/makepkg.sh.in b/scripts/makepkg.sh.in
index eb1329c7..12cda8ce 100644
--- a/scripts/makepkg.sh.in
+++ b/scripts/makepkg.sh.in
@@ -1156,7 +1156,8 @@ write_pkginfo() {
 	else
 		local packager="Unknown Packager"
 	fi
-	local size="$(find . -print0 | xargs -0 @SIZECMD@ | awk '{ sum += $1 } END { print sum }')"
+	local size="$(@DUPATH@ -sk)"
+	size="$(( ${size%%[^0-9]*} * 1024 ))"
 
 	msg2 "$(gettext "Generating %s file...")" ".PKGINFO"
 	echo "# Generated by makepkg $myver"