diff --git a/t/basic.t b/t/basic.t
index d9ddfac..d85ff06 100644
--- a/t/basic.t
+++ b/t/basic.t
@@ -100,7 +100,7 @@ my $data;
         ok($format->{Wrap});
         is_deeply($format->{Fill}, [0, undef, undef]);
         is_deeply($format->{BdrStyle}, [(1) x 4]);
-        is_deeply($format->{BdrColor}, [(undef) x 4]);
+        is_deeply($format->{BdrColor}, [('#000000') x 4]);
         is_deeply($format->{BdrDiag}, [0, 0, undef]);
 
         my $font = $format->{Font};
diff --git a/t/data/Test.json b/t/data/Test.json
index 685a403..64fc6e1 100644
--- a/t/data/Test.json
+++ b/t/data/Test.json
@@ -28,10 +28,10 @@
                         "thin"
                      ],
                      "border_color" : [
-                        null,
-                        null,
-                        null,
-                        null
+                        "#000000",
+                        "#000000",
+                        "#000000",
+                        "#000000"
                      ],
                      "text_wrap" : true
                   },