diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/RangeExpression.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/RangeExpression.php
index 5e85715087..a8b95e7455 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/RangeExpression.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/RangeExpression.php
@@ -59,8 +59,9 @@ class RangeExpression extends Node
             }
         }
 
+        $field = $context->normalizeField($this->field->getValue());
         $query = array();
-        $query['range'][$this->field->getValue()] = $params;
+        $query['range'][$field] = $params;
 
         return $query;
     }
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/QueryContext.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/QueryContext.php
index 2159672f1f..dd1b86a3a3 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/QueryContext.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/QueryContext.php
@@ -73,6 +73,13 @@ class QueryContext
         return $fields;
     }
 
+    public function normalizeField($field)
+    {
+        // TODO Private fields handling
+        // TODO Field label dereferencing (we only want names)
+        return sprintf('caption.%s', $field);
+    }
+
     public function getFields()
     {
         return $this->fields;