diff --git a/Algorithm/include/Algorithm/PageParser.h b/Algorithm/include/Algorithm/PageParser.h
index e382fc318352e..3ca01d87bcba3 100644
--- a/Algorithm/include/Algorithm/PageParser.h
+++ b/Algorithm/include/Algorithm/PageParser.h
@@ -255,12 +255,12 @@ class PageParser
       return mElement;
     }
     // comparison
-    bool operator==(const SelfType& rh)
+    bool operator==(const SelfType& rh) const
     {
       return mPosition == rh.mPosition;
     }
     // comparison
-    bool operator!=(const SelfType& rh)
+    bool operator!=(const SelfType& rh) const
     {
       return mPosition != rh.mPosition;
     }