diff --git a/farm.install b/farm.install
index 142d6521..2dc64a67 100644
--- a/farm.install
+++ b/farm.install
@@ -68,7 +68,7 @@ function farm_install_modules(array &$install_state) {
 
   // Assemble the batch operation for installing modules.
   $operations = [];
-  foreach ($modules as $module => $weight) {
+  foreach ($modules as $module) {
     $operations[] = [
       '_farm_install_module_batch',
       [
diff --git a/src/Form/FarmModulesForm.php b/src/Form/FarmModulesForm.php
index ab774b9d..33cf0c31 100644
--- a/src/Form/FarmModulesForm.php
+++ b/src/Form/FarmModulesForm.php
@@ -115,7 +115,8 @@ class FarmModulesForm extends FormBase {
    * {@inheritdoc}
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
-    $modules = array_filter($form_state->getValue('modules'));
+    // Build array of module names to install.
+    $modules = array_values(array_filter($form_state->getValue('modules')));
     $this->state->set('farm.install_modules', $modules);
   }