diff --git a/wagtail/users/forms.py b/wagtail/users/forms.py
index 217e6d50ca..b77e56d898 100644
--- a/wagtail/users/forms.py
+++ b/wagtail/users/forms.py
@@ -421,6 +421,10 @@ class CurrentTimeZoneForm(forms.ModelForm):
 
 
 class AvatarPreferencesForm(forms.ModelForm):
+    avatar = forms.ImageField(
+        label=_("Upload a profile picture"), required=True
+    )
+
     class Meta:
         model = UserProfile
         fields = ["avatar"]