diff --git a/kitty_tests/datatypes.py b/kitty_tests/datatypes.py
index 2ccdd7fcb..33459d852 100644
--- a/kitty_tests/datatypes.py
+++ b/kitty_tests/datatypes.py
@@ -338,3 +338,9 @@ class TestDataTypes(BaseTest):
         l.set_text('1', 0, 1, c)
         self.ae(l.as_ansi(), '\x1b[0m\x1b[1m\x1b[3m\x1b[7m\x1b[9m\x1b[38;5;4m\x1b[48;2;1;2;3m\x1b[58;5;5m' '1'
                 '\x1b[22m\x1b[23m\x1b[27m\x1b[29m\x1b[39m\x1b[49m\x1b[59m' '0000')
+        lb = filled_line_buf()
+        for i in range(lb.ynum):
+            lb.set_continued(i, True)
+        a = []
+        lb.as_ansi(a.append)
+        self.ae(a, ['\x1b[0m' + str(lb.line(i)) for i in range(lb.ynum)])