diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91e943ed6e9..3c2aa33e7ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -43,6 +43,7 @@ The types of changes are:
 
 ### Fixed
 - Allows CDN to cache empty experience responses from fides.js API  [#4113](https://github.com/ethyca/fides/pull/4113)
+- Fixed `identity_special_purpose` unique constraint definition [#4174](https://github.com/ethyca/fides/pull/4174/files)
 
 ## [2.20.2](https://github.com/ethyca/fides/compare/2.20.1...2.20.2)
 
diff --git a/src/fides/api/alembic/migrations/versions/4cb3b5af4160_update_special_purpose_unique_constraint.py b/src/fides/api/alembic/migrations/versions/4cb3b5af4160_update_special_purpose_unique_constraint.py
new file mode 100644
index 00000000000..7fb378e39b1
--- /dev/null
+++ b/src/fides/api/alembic/migrations/versions/4cb3b5af4160_update_special_purpose_unique_constraint.py
@@ -0,0 +1,37 @@
+"""update_special_purpose_unique_constraint
+
+Revision ID: 4cb3b5af4160
+Revises: 8c54e1e5bdc4
+Create Date: 2023-09-27 22:58:43.064996
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "4cb3b5af4160"
+down_revision = "8c54e1e5bdc4"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.drop_constraint(
+        "identity_special_purpose", "currentprivacypreference", type_="unique"
+    )
+    op.create_unique_constraint(
+        "identity_special_purpose",
+        "currentprivacypreference",
+        ["provided_identity_id", "special_purpose"],
+    )
+
+
+def downgrade():
+    op.drop_constraint(
+        "identity_special_purpose", "currentprivacypreference", type_="unique"
+    )
+    op.create_unique_constraint(
+        "identity_special_purpose",
+        "currentprivacypreference",
+        ["provided_identity_id", "purpose"],
+    )
diff --git a/src/fides/api/models/privacy_preference.py b/src/fides/api/models/privacy_preference.py
index 93c7d8d7f82..1307e9fedbe 100644
--- a/src/fides/api/models/privacy_preference.py
+++ b/src/fides/api/models/privacy_preference.py
@@ -693,7 +693,7 @@ class CurrentPrivacyPreference(LastSavedMixin, Base):
             name="fides_user_device_identity_purpose",
         ),
         UniqueConstraint(
-            "provided_identity_id", "purpose", name="identity_special_purpose"
+            "provided_identity_id", "special_purpose", name="identity_special_purpose"
         ),
         UniqueConstraint(
             "fides_user_device_provided_identity_id",