diff --git a/aleksis/core/models.py b/aleksis/core/models.py
index 4d2ec4b39a45f7a924fb753eacb8d3a0e8bba7cd..bd26f4f4edbc04bbef679ae92311b1215138f3ad 100644
--- a/aleksis/core/models.py
+++ b/aleksis/core/models.py
@@ -201,7 +201,7 @@ class Person(ExtensibleModel):
     place_of_birth = models.CharField(verbose_name=_("Place of birth"), max_length=255, blank=True)
     sex = models.CharField(verbose_name=_("Sex"), max_length=1, choices=SEX_CHOICES, blank=True)
 
-    photo = ImageField(
+    photo = models.ImageField(
         verbose_name=_("Photo"),
         blank=True,
         null=True,
@@ -492,7 +492,7 @@ class Group(SchoolTermRelatedExtensibleModel):
         AdditionalField, verbose_name=_("Additional fields"), blank=True
     )
 
-    photo = ImageField(
+    photo = models.ImageField(
         verbose_name=_("Photo"),
         blank=True,
         null=True,