diff --git a/config/settings/base.py b/config/settings/base.py
index 9b151e0b0..adba814a7 100644
--- a/config/settings/base.py
+++ b/config/settings/base.py
@@ -333,6 +333,7 @@
     "machina.core.markdown.markdown",
     {"safe_mode": False, "extras": {"break-on-newline": True, "code-friendly": True, "nofollow": True}},
 )
+SUPPORTED_IMAGE_FILE_TYPES = {"image/png": "png", "image/jpeg": "jpeg", "image/jpg": "jpg", "image/gif": "gif"}
 
 # Django sites framework
 SITE_ID = 1
diff --git a/lacommunaute/forum/forms.py b/lacommunaute/forum/forms.py
index d02288980..9288370e5 100644
--- a/lacommunaute/forum/forms.py
+++ b/lacommunaute/forum/forms.py
@@ -1,6 +1,7 @@
 import re
 
 from django import forms
+from django.conf import settings
 
 from lacommunaute.forum.models import Forum
 
@@ -29,7 +30,11 @@ class ForumForm(forms.ModelForm):
     description = forms.CharField(
         widget=forms.Textarea(attrs={"rows": 20}), required=False, label="Contenu (markdown autorisé)"
     )
-    image = forms.ImageField(required=False, label="Banniere de couverture, format 1200 x 630 pixels recommandé")
+    image = forms.ImageField(
+        required=False,
+        label="Banniere de couverture, format 1200 x 630 pixels recommandé",
+        widget=forms.FileInput(attrs={"accept": settings.SUPPORTED_IMAGE_FILE_TYPES.keys()}),
+    )
 
     def save(self, commit=True):
         forum = super().save(commit=False)
diff --git a/lacommunaute/forum/tests/test_forum_updateview.py b/lacommunaute/forum/tests/test_forum_updateview.py
index aeb757e97..465acad9d 100644
--- a/lacommunaute/forum/tests/test_forum_updateview.py
+++ b/lacommunaute/forum/tests/test_forum_updateview.py
@@ -14,7 +14,7 @@
 @pytest.fixture
 def fake_image():
     fake = Faker()
-    image_name = fake.pystr(min_chars=30, max_chars=40, prefix="pytest_", suffix=".png")
+    image_name = fake.pystr(min_chars=30, max_chars=40, prefix="pytest_", suffix=".jpg")
 
     image = Image.new("RGB", (100, 100))
     image_file = BytesIO()