diff --git a/src/db/unit_tests/dbGDS2Writer.cc b/src/db/unit_tests/dbGDS2Writer.cc
index 7c4f37358..b1f6f1246 100644
--- a/src/db/unit_tests/dbGDS2Writer.cc
+++ b/src/db/unit_tests/dbGDS2Writer.cc
@@ -1145,3 +1145,11 @@ TEST(121)
   opt.max_vertex_count = 4;
   run_test (_this, "t121.oas.gz", "t121_au.gds.gz", true, opt);
 }
+
+//  Extreme fracturing by max. points
+TEST(166)
+{
+  db::GDS2WriterOptions opt;
+  opt.max_vertex_count = 4;
+  run_test (_this, "t166.oas.gz", "t166_au.gds.gz", true, opt);
+}
diff --git a/testdata/gds/bug_166.oas.gz b/testdata/gds/bug_166.oas.gz
new file mode 100644
index 000000000..3a209870a
Binary files /dev/null and b/testdata/gds/bug_166.oas.gz differ
diff --git a/testdata/gds/bug_166_au.gds.gz b/testdata/gds/bug_166_au.gds.gz
new file mode 100644
index 000000000..7766ef28e
Binary files /dev/null and b/testdata/gds/bug_166_au.gds.gz differ