diff --git a/pre_commit_hooks/check_merge_conflict.py b/pre_commit_hooks/check_merge_conflict.py
index c20a8af7..3921a37d 100644
--- a/pre_commit_hooks/check_merge_conflict.py
+++ b/pre_commit_hooks/check_merge_conflict.py
@@ -8,6 +8,8 @@
     b'<<<<<<< ',
     b'======= ',
     b'=======\n',
+    b'||||||| ',
+    b'|||||||\n',
     b'>>>>>>> ',
 ]
 
diff --git a/tests/check_merge_conflict_test.py b/tests/check_merge_conflict_test.py
index fccf41ff..ae6149dd 100644
--- a/tests/check_merge_conflict_test.py
+++ b/tests/check_merge_conflict_test.py
@@ -129,8 +129,32 @@ def test_does_not_care_when_not_in_a_merge(tmpdir):
     f.write_binary(b'problem\n=======\n')
     assert main([str(f.realpath())]) == 0
 
+    f = tmpdir.join('README.md')
+    f.write_binary(b'problem\n======= \n')
+    assert main([str(f.realpath())]) == 0
+
+    f = tmpdir.join('README.md')
+    f.write_binary(b'problem\n|||||||\n')
+    assert main([str(f.realpath()), '--assume-in-merge']) == 0
+
+    f = tmpdir.join('README.md')
+    f.write_binary(b'problem\n||||||| \n')
+    assert main([str(f.realpath()), '--assume-in-merge']) == 0
+
 
 def test_care_when_assumed_merge(tmpdir):
     f = tmpdir.join('README.md')
     f.write_binary(b'problem\n=======\n')
     assert main([str(f.realpath()), '--assume-in-merge']) == 1
+
+    f = tmpdir.join('README.md')
+    f.write_binary(b'problem\n======= \n')
+    assert main([str(f.realpath()), '--assume-in-merge']) == 1
+
+    f = tmpdir.join('README.md')
+    f.write_binary(b'problem\n|||||||\n')
+    assert main([str(f.realpath()), '--assume-in-merge']) == 1
+
+    f = tmpdir.join('README.md')
+    f.write_binary(b'problem\n||||||| \n')
+    assert main([str(f.realpath()), '--assume-in-merge']) == 1