diff --git a/debian/changelog b/debian/changelog
index 6fc1dbc..3bf2738 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -17,6 +17,7 @@ xen-tools (4.4+dev-1) UNRELEASED; urgency=low
     + pygrub detection: Prefer /usr/lib/xen-default over /usr/lib/xen-x.y.
     + Fix lvcreate awaiting user input when creating swap lv (Closes: #754517)
       Thanks Eric Engstrom!
+    + Fix missing quoting in shell function "assert" in hooks/common.sh.
   * Bump Standards-Version to 3.9.6 (no changes needed)
   * Fix lintian warning depends-on-perl-modules.
 
diff --git a/hooks/common.sh b/hooks/common.sh
index 86fc636..d1a6a4a 100755
--- a/hooks/common.sh
+++ b/hooks/common.sh
@@ -47,7 +47,7 @@ assert ()
         shift
     fi
 
-    if [ ! $* ] ; then
+    if [ ! "$*" ] ; then
         echo "assert failed: $0:$lineno [$*]"
         exit
     fi