diff --git a/core/apps/products/management/commands/import_units.py b/core/apps/products/management/commands/import_units.py
index 23855fc..efc2335 100644
--- a/core/apps/products/management/commands/import_units.py
+++ b/core/apps/products/management/commands/import_units.py
@@ -18,5 +18,4 @@ class Command(BaseCommand):
             Unity.objects.get_or_create(
                 value=item['name']['uz']
             )
-
         self.stdout.write("Units added")
\ No newline at end of file
diff --git a/core/apps/products/models/unity.py b/core/apps/products/models/unity.py
index 7ac63c1..78013da 100644
--- a/core/apps/products/models/unity.py
+++ b/core/apps/products/models/unity.py
@@ -5,7 +5,7 @@ from core.apps.shared.models import BaseModel
 
 
 class Unity(BaseModel):
-    value = models.CharField(max_length=50)
+    value = models.CharField(max_length=50, unique=True)
 
     def __str__(self):
         return self.value