diff --git a/sflock/unpack/zip.py b/sflock/unpack/zip.py
index 66dc39c6..79bd191d 100644
--- a/sflock/unpack/zip.py
+++ b/sflock/unpack/zip.py
@@ -43,6 +43,18 @@ def _decrypt(self, archive, entry, password):
                 contents=archive.read(entry),
                 password=password
             )
+        except NotImplementedError as nae:
+            # Deflate64
+            # Instead of throwing an UnpackException return failed.
+            # TODO: 7z supports this format, so pick could be updated to detect this
+            #       compression type and use the 7z unpacker instead.
+            #
+            if "compression type 9" in nae.args[0]:
+                return File(
+                    relapath=entry.filename,
+                    mode="failed",
+                    description="%s" % nae
+                )
         except RuntimeError as e:
             if "password required" not in e.args[0] and \
                     "Bad password" not in e.args[0]:
diff --git a/tests/files/zip_deflate64.zip b/tests/files/zip_deflate64.zip
new file mode 100644
index 00000000..33581455
Binary files /dev/null and b/tests/files/zip_deflate64.zip differ
diff --git a/tests/test_zip.py b/tests/test_zip.py
index 8607e3d3..2a2edace 100644
--- a/tests/test_zip.py
+++ b/tests/test_zip.py
@@ -130,3 +130,13 @@ def test_garbage2(self):
         assert len(files) == 1
         assert not files[0].children
         assert files[0].mode == "failed"
+
+    def test_deflate64(self):
+        t = ZipFile(f("zip_deflate64.zip"))
+        assert t.handles() is True
+        assert not t.f.selected
+        files = t.unpack()
+        assert len(files) == 1
+        assert not files[0].children
+        assert files[0].mode == "failed"
+