diff --git a/includes/module.inc b/includes/module.inc
index 448ff56b9e7..20ea806ed93 100644
--- a/includes/module.inc
+++ b/includes/module.inc
@@ -95,6 +95,7 @@ function module_rebuild_cache() {
     'package' => 'Other',
     'version' => NULL,
     'php' => DRUPAL_MINIMUM_PHP,
+    'files' => array(),
   );
 
   foreach ($files as $filename => $file) {
diff --git a/modules/system/system.admin.inc b/modules/system/system.admin.inc
index 2cf868bec85..a0394ce74b0 100644
--- a/modules/system/system.admin.inc
+++ b/modules/system/system.admin.inc
@@ -742,7 +742,7 @@ function _system_modules_build_row($info, $extra) {
   $status_long = '';
 
   // Check the core compatibility.
-  if (!isset($info['core']) || $info['core'] != DRUPAL_CORE_COMPATIBILITY) {
+  if (!isset($info['core']) || $info['core'] != DRUPAL_CORE_COMPATIBILITY || empty($info['files'])) {
     $compatible = FALSE;
     $status_short .= t('Incompatible with this version of Drupal core. ');
     $status_long .= t('This version is incompatible with the !core_version version of Drupal core. ', array('!core_version' => VERSION));