diff --git a/plugins/context_reaction_block.inc b/plugins/context_reaction_block.inc
index ea54b25f3130248aa4f8c85d8096f66342436b6e..46db122b0c432c87075ed24dfe2e0c0f508c7a39 100644
--- a/plugins/context_reaction_block.inc
+++ b/plugins/context_reaction_block.inc
@@ -330,9 +330,16 @@ class context_reaction_block extends context_reaction {
     static $block_info;
 
     if (!isset($block_info) || $reset) {
-      // We don't retrieve the block info cache when on admin pages as a
+      $block_info = array();
+
+      // Force a reset of the block info cache when on admin pages as a
       // variety of administrative UI tasks can create or alter block info.
-      $block_info = $reset || arg(0) === 'admin' ? array() : context_cache_get('block_info');
+      if (arg(0) === 'admin') {
+        context_cache_set('block_info', NULL);
+      }
+      else if (!$reset) {
+        $block_info = context_cache_get('block_info');
+      }
       if (empty($block_info)) {
         $block_info = array();
         foreach (module_implements('block') as $module) {