diff --git a/mastercard.json b/mastercard.json
index 717cad4..06fbaf6 100644
--- a/mastercard.json
+++ b/mastercard.json
@@ -22,7 +22,7 @@
             "  {% set payment_color='white' %}",
             "{% endif %}"
         ],
-        "markerSign": "<img data-src='img/mastercard.png'>",
+        "markerSign": "<img height='15' data-src='img/mastercard.png'>",
         "markerSymbol": "{{ markerPointer({\"fillColor\":payment_color})|raw }}"
     }
 }