diff --git a/src/mesa/program/hash_table.h b/src/mesa/program/hash_table.h
index 941d28a4ce9..47c37ae40ec 100644
--- a/src/mesa/program/hash_table.h
+++ b/src/mesa/program/hash_table.h
@@ -213,6 +213,14 @@ public:
       hash_table_dtor(this->ht);
    }
 
+   /**
+    * Remove all mappings from this map.
+    */
+   void clear()
+   {
+      hash_table_clear(this->ht);
+   }
+
    /**
     * Get the value associated with a particular key
     *