diff --git a/activities/views/compose.py b/activities/views/compose.py
index 58dc7fc..2fa0bbb 100644
--- a/activities/views/compose.py
+++ b/activities/views/compose.py
@@ -156,6 +156,17 @@ class ImageUpload(FormView):
         image = forms.ImageField()
         description = forms.CharField(required=False)
 
+        def clean_image(self):
+            value = self.cleaned_data["image"]
+            if value.size > 1024 * 1024 * 1:
+                # Erase the file from our data to stop trying to show it again
+                self.files = {}
+                raise forms.ValidationError("File must be 10MB or less")
+            return value
+
+    def form_invalid(self, form):
+        return super().form_invalid(form)
+
     def form_valid(self, form):
         # Make a PostAttachment
         thumbnail_file = resize_image(form.cleaned_data["image"], size=(400, 225))
diff --git a/templates/forms/_field.html b/templates/forms/_field.html
index 41f59d8..d101889 100644
--- a/templates/forms/_field.html
+++ b/templates/forms/_field.html
@@ -17,7 +17,7 @@
         {% endif %}
         {{ field }}
     </div>
-    {% if field.field.widget.input_type == "file" and field.value%}
+    {% if field.field.widget.input_type == "file" and field.value %}
         <img class="preview" src="{{ field.value }}">
     {% endif %}
 </div>