diff --git a/app/public/cantusdata/migrations/0003_chant_differentiae_database.py b/app/public/cantusdata/migrations/0003_chant_differentiae_database.py
index 7514cd2f..1e42f488 100644
--- a/app/public/cantusdata/migrations/0003_chant_differentiae_database.py
+++ b/app/public/cantusdata/migrations/0003_chant_differentiae_database.py
@@ -1,4 +1,4 @@
-# Generated by Django 4.2.7 on 2024-01-22 17:18
+# Generated by Django 4.2.7 on 2024-01-25 22:26
 
 from django.db import migrations, models
 
@@ -12,6 +12,6 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name="chant",
             name="differentiae_database",
-            field=models.CharField(blank=True, max_length=255),
+            field=models.CharField(blank=True, max_length=15, null=True),
         ),
     ]
diff --git a/app/public/cantusdata/models/chant.py b/app/public/cantusdata/models/chant.py
index 67cb615c..3e3d650c 100644
--- a/app/public/cantusdata/models/chant.py
+++ b/app/public/cantusdata/models/chant.py
@@ -25,7 +25,7 @@ class Meta:
     lit_position = models.CharField(max_length=255, blank=True, null=True)
     mode = models.CharField(max_length=255, blank=True, null=True)
     differentia = models.CharField(max_length=255, blank=True, null=True)
-    differentiae_database = models.CharField(max_length=255, blank=True)
+    differentiae_database = models.CharField(max_length=15, blank=True, null=True)
     finalis = models.CharField(max_length=255, blank=True, null=True)
     incipit = models.TextField(blank=True, null=True)
     full_text = models.TextField(blank=True, null=True)