diff --git page_title/modules/blog.page_title.inc page_title/modules/blog.page_title.inc
index dd6ed50..6d7870c 100755
--- page_title/modules/blog.page_title.inc
+++ page_title/modules/blog.page_title.inc
@@ -4,6 +4,7 @@
  * @file
  * Blog implementations of the page title hooks
  */
+define("PAGE_TITLE_BLOG_SUB_MODULE", TRUE);
 
 
 /**
diff --git page_title/modules/comment.page_title.inc page_title/modules/comment.page_title.inc
index 20846fd..c78713a 100755
--- page_title/modules/comment.page_title.inc
+++ page_title/modules/comment.page_title.inc
@@ -4,6 +4,7 @@
  * @file
  * Comment implementations of the page title hooks
  */
+define("PAGE_TITLE_COMMENT_SUB_MODULE", TRUE);
 
 
 /**
diff --git page_title/modules/forum.page_title.inc page_title/modules/forum.page_title.inc
index b69d168..cb7aa25 100755
--- page_title/modules/forum.page_title.inc
+++ page_title/modules/forum.page_title.inc
@@ -4,7 +4,7 @@
  * @file
  * Forum implementations of the page title hooks
  */
-
+define("PAGE_TITLE_FORUM_SUB_MODULE", TRUE);
 
 /**
  * Implements hook_page_title_alter().
diff --git page_title/modules/node.page_title.inc page_title/modules/node.page_title.inc
index a94d3a5..7a5983e 100755
--- page_title/modules/node.page_title.inc
+++ page_title/modules/node.page_title.inc
@@ -4,7 +4,7 @@
  * @file
  * Node implementations of the page title hooks
  */
-
+define("PAGE_TITLE_NODE_SUB_MODULE", TRUE);
 
 /**
  * Implements hook_page_title_alter().
diff --git page_title/modules/page_title.page_title.inc page_title/modules/page_title.page_title.inc
index b6034a9..dfed104 100755
--- page_title/modules/page_title.page_title.inc
+++ page_title/modules/page_title.page_title.inc
@@ -4,6 +4,7 @@
  * @file
  * Page Title implementations of the page title hooks
  */
+define("PAGE_TITLE_PAGE_TITLE_SUB_MODULE", TRUE);
 
 
 /**
diff --git page_title/modules/taxonomy.page_title.inc page_title/modules/taxonomy.page_title.inc
index 14ccf6e..aa767be 100755
--- page_title/modules/taxonomy.page_title.inc
+++ page_title/modules/taxonomy.page_title.inc
@@ -4,6 +4,7 @@
  * @file
  * Taxonomy implementations of the page title hooks
  */
+define("PAGE_TITLE_TAXONOMY_SUB_MODULE", TRUE);
 
 
 /**
diff --git page_title/modules/uc_catalog.page_title.inc page_title/modules/uc_catalog.page_title.inc
index 3bd9910..38b4bc5 100644
--- page_title/modules/uc_catalog.page_title.inc
+++ page_title/modules/uc_catalog.page_title.inc
@@ -4,6 +4,7 @@
  * @file
  * Ubercart Catalog implementations of the page title hooks
  */
+define("PAGE_TITLE_UC_CATALOG_SUB_MODULE", TRUE);
 
 
 /**
diff --git page_title/modules/user.page_title.inc page_title/modules/user.page_title.inc
index f67fb44..1435720 100755
--- page_title/modules/user.page_title.inc
+++ page_title/modules/user.page_title.inc
@@ -4,7 +4,7 @@
  * @file
  * User implementations of the page title hooks
  */
-
+define("PAGE_TITLE_USER_SUB_MODULE", TRUE);
 
 /**
  * Implements hook_page_title_alter().
diff --git page_title/modules/views.page_title.inc page_title/modules/views.page_title.inc
index 1dd87ff..ff4f734 100755
--- page_title/modules/views.page_title.inc
+++ page_title/modules/views.page_title.inc
@@ -4,6 +4,7 @@
  * @file
  * Views implementations of the page title hooks
  */
+define("PAGE_TITLE_VIEWS_SUB_MODULE", TRUE);
 
 
 /**
diff --git page_title/page_title.module page_title/page_title.module
index 321a57c..436da61 100755
--- page_title/page_title.module
+++ page_title/page_title.module
@@ -654,7 +654,8 @@ function page_title_include_api_files() {
   // Include relevant page_title.inc's. We cannot use drupal_load() here due to the folder structure.
   // We also avoice using include_once due to its performance hit on the Filesystem
   foreach (page_title_get_module_apis() as $module => $info) {
-    if (file_exists(DRUPAL_ROOT . "/{$info['path']}/{$module}.page_title.inc")) {
+    if (file_exists(DRUPAL_ROOT . "/{$info['path']}/{$module}.page_title.inc")
+      && !defined("PAGE_TITLE_".strtoupper($module)."_SUB_MODULE")) {
       include DRUPAL_ROOT . "/{$info['path']}/{$module}.page_title.inc";
     }
   }