diff --git a/biscuit/core/templates/core/person_card.html b/biscuit/core/templates/core/person_card.html
index a3781673d06371a7c366697b00c05b98942ee769..7afad180da4027bc9763b60990dfbb413c742aa5 100644
--- a/biscuit/core/templates/core/person_card.html
+++ b/biscuit/core/templates/core/person_card.html
@@ -5,7 +5,7 @@
     <div class="row no-gutters">
       <div class="col-sm">
         {% if person.photo %}
-          <img class="person-img" src="{% cropped_thumbnail person 'photo_cropping' max_size=300x400 %}" alt="{{ person.first_name }} {{ person.last_name }}" />
+          <img class="person-img" src="{% cropped_thumbnail person 'photo_cropping' max_size='300x400' %}" alt="{{ person.first_name }} {{ person.last_name }}" />
         {% else %}
           <img class="person-img" src="{% static 'img/fallback.png' %}" alt="{{ person.first_name }} {{ person.last_name }}" />
         {% endif %}
diff --git a/biscuit/core/templates/core/person_full.html b/biscuit/core/templates/core/person_full.html
index 286f5bc47ea2084aa2763b36f6e6353bc227a67a..144ae522bca2b3bb1d80c3302a38d3e2431dd12e 100644
--- a/biscuit/core/templates/core/person_full.html
+++ b/biscuit/core/templates/core/person_full.html
@@ -16,7 +16,7 @@
    <tr>
     <td rowspan="6">
      {% if person.photo %}
-      <img class="person-img" src="{% cropped_thumbnail person 'photo_cropping' max_size=300x400 %}" alt="{{ person.first_name }} {{ person.last_name }}" />
+      <img class="person-img" src="{% cropped_thumbnail person 'photo_cropping' max_size='300x400' %}" alt="{{ person.first_name }} {{ person.last_name }}" />
      {% else %}
       <img class="person-img" src="{% static 'img/fallback.png' %}" alt="{{ person.first_name }} {{ person.last_name }}" />
      {% endif %}