diff --git a/dictdiffer/unify.py b/dictdiffer/unify.py
index 6bac345..4950834 100644
--- a/dictdiffer/unify.py
+++ b/dictdiffer/unify.py
@@ -37,7 +37,8 @@ def unify(self, first_patches, second_patches, conflicts):
                 if conflict.take_patch() != patch:
                     continue
 
-            self.unified_patches.append(patch)
+            if patch not in self.unified_patches:
+                self.unified_patches.append(patch)
 
         return self.unified_patches
 
diff --git a/tests/test_unify.py b/tests/test_unify.py
index 9e9c701..d8c4d36 100644
--- a/tests/test_unify.py
+++ b/tests/test_unify.py
@@ -40,3 +40,15 @@ def test_unify(self):
         u.unify([p1], [p2], [c])
 
         self.assertEqual(u.unified_patches, [p1])
+
+    def test_unify_duplicate_patches(self):
+        u = Unifier()
+
+        p1 = ('remove', '', [('a', 'b')])
+        p2 = ('remove', '', [('a', 'b')])
+        c = Conflict(p1, p2)
+        c.take = 'f'
+
+        u.unify([p1], [p2], [c])
+
+        self.assertEqual(u.unified_patches, [p1])