diff --git a/includes/install.core.inc b/includes/install.core.inc
index a74dfdf..beb1b91 100644
--- a/includes/install.core.inc
+++ b/includes/install.core.inc
@@ -570,11 +570,16 @@ function install_tasks($install_state) {
 
   // Now add any tasks defined by the installation profile.
   if (!empty($install_state['parameters']['profile'])) {
-    $function = $install_state['parameters']['profile'] . '_install_tasks';
-    if (function_exists($function)) {
-      $result = $function($install_state);
-      if (is_array($result)) {
-        $tasks += $result;
+    // Load the profile install file, because it is not loaded when batch operations are being executed.
+    $profile_install_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] . '/' . $install_state['parameters']['profile'] . '.install';
+    if (is_file($profile_install_file)) {
+      include_once $profile_install_file;
+      $function = $install_state['parameters']['profile'] . '_install_tasks';
+      if (function_exists($function)) {
+        $result = $function($install_state);
+        if (is_array($result)) {
+          $tasks += $result;
+        }
       }
     }
   }