diff --git a/startlxde.in b/startlxde.in
index fd20816..692965c 100755
--- a/startlxde.in
+++ b/startlxde.in
@@ -41,6 +41,16 @@ if which dbus-launch >/dev/null && test -z "$DBUS_SESSION_BUS_ADDRESS"; then
 fi
 
 export XDG_MENU_PREFIX="lxde-"
+
+# Since shared-mime-info-0.90-alt3 XDG_DATA_DIRS not exported. We need to define
+# the set of base directories explicitly.
+if [ -n "$XDG_DATA_DIRS" ]; then
+	XDG_DATA_DIRS="/usr/share/lxde:$XDG_DATA_DIRS"
+else
+	XDG_DATA_DIRS="/usr/share/lxde:/usr/share:/usr/local/share"
+fi
+export XDG_DATA_DIRS
+
 export XDG_CURRENT_DESKTOP="LXDE"
 
 # Start the LXDE session