diff --git a/ChangeLog b/ChangeLog
index bac09e101..7b44c32fc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-05-18  Colin Watson  <cjwatson@ubuntu.com>
+
+	* util/grub-mkrescue.in: Use portable `.' rather than non-portable
+	`source'.
+
 2011-05-18  Colin Watson  <cjwatson@ubuntu.com>
 
 	* grub-core/genmod.sh.in: Use 'set -e' rather than '#! /bin/sh -e',
diff --git a/util/grub-mkrescue.in b/util/grub-mkrescue.in
index 2b6c9d391..8367c4dd4 100644
--- a/util/grub-mkrescue.in
+++ b/util/grub-mkrescue.in
@@ -229,7 +229,7 @@ if [ "${override_dir}" = "" ] ; then
         process_input_dir ${efi64_dir} x86_64-efi
     fi
 else
-    source "${override_dir}"/modinfo.sh
+    . "${override_dir}"/modinfo.sh
     process_input_dir "${override_dir}" ${grub_modinfo_target_cpu}-${grub_modinfo_platform}
     multiboot_dir=
     pc_dir=