diff --git a/plone/app/contenttypes/indexers.py b/plone/app/contenttypes/indexers.py
index 973dfe83..2517b616 100644
--- a/plone/app/contenttypes/indexers.py
+++ b/plone/app/contenttypes/indexers.py
@@ -190,3 +190,8 @@ def getIcon(obj):
     if obj.aq_base.image:
         return True
     return False
+
+
+@indexer(IDexterityContent)
+def getAltTag(obj):
+    return obj.alt_text
diff --git a/plone/app/contenttypes/indexers.zcml b/plone/app/contenttypes/indexers.zcml
index 52b15f0c..6c79c341 100644
--- a/plone/app/contenttypes/indexers.zcml
+++ b/plone/app/contenttypes/indexers.zcml
@@ -50,5 +50,9 @@
       factory=".indexers.mime_type"
       name="mime_type"
       />
+  <adapter
+      factory=".indexers.getAltTag"
+      name="alt_text"
+      />
 
 </configure>