diff --git a/root/srv/setup-ttrss.sh b/root/srv/setup-ttrss.sh
index e3d549e..697cd7c 100755
--- a/root/srv/setup-ttrss.sh
+++ b/root/srv/setup-ttrss.sh
@@ -108,6 +108,11 @@ setup_ttrss()
 
     echo "Setup: URL is: $TTRSS_SELF_URL"
 
+    # By default we want to reset the theme to the default one.
+    if [ -z ${TTRSS_THEME_RESET} ]; then
+        TTRSS_THEME_RESET=1
+    fi
+
     # Patch URL path.
     sed -i -e 's@htt.*/@'"${TTRSS_SELF_URL}"'@g' ${TTRSS_PATH}/config.php
 
@@ -131,6 +136,11 @@ setup_ttrss()
     echo "Setup: Additional plugins: $TTRSS_PLUGINS"
 
     sed -i -e "s/.*define('PLUGINS'.*/define('PLUGINS', '$TTRSS_PLUGINS, auth_internal, note, updater');/g" ${TTRSS_PATH}/config.php
+
+    # Export variables for sub shells.
+    export TTRSS_PATH
+    export TTRSS_PATH_PLUGINS
+    export TTRSS_THEME_RESET
 }
 
 setup_db()
diff --git a/root/srv/ttrss-configure-db.php b/root/srv/ttrss-configure-db.php
index 7c7a4ad..39d6b05 100644
--- a/root/srv/ttrss-configure-db.php
+++ b/root/srv/ttrss-configure-db.php
@@ -65,10 +65,12 @@ try {
     echo 'Connection to database successful' . PHP_EOL;
     // Reached this point => table found, assume db is complete
 
-    // Make sure to set the default theme provided by TT-RSS.
-    // Other themes might break everything after an update, so play safe here.
-    echo 'Resetting theme to default ...' . PHP_EOL;
-    $pdo->query("UPDATE ttrss_user_prefs SET value = '' WHERE pref_name = 'USER_CSS_THEME'");
+    if (env('TTRSS_THEME_RESET', '1')) {
+        // Make sure to set the default theme provided by TT-RSS.
+        // Other themes might break everything after an update, so play safe here.
+        echo 'Resetting theme to default ...' . PHP_EOL;
+        $pdo->query("UPDATE ttrss_user_prefs SET value = '' WHERE pref_name = 'USER_CSS_THEME'");
+    }
 }
 catch (PDOException $e) {
     echo 'Database table not found, applying schema... ' . PHP_EOL;