diff --git a/progit/model.py b/progit/model.py
index a650d87..a1168c8 100644
--- a/progit/model.py
+++ b/progit/model.py
@@ -367,7 +367,11 @@ class TagIssue(BASE):
 
     __tablename__ = 'tags_issues'
 
-    tag = sa.Column(sa.Text(), primary_key=True)
+    tag = sa.Column(
+        sa.Text(),
+        sa.ForeignKey(
+            'tags.tag', ondelete='CASCADE', onupdate='CASCADE'),
+        primary_key=True)
     issue_id = sa.Column(
         sa.Integer,
         sa.ForeignKey(