diff --git a/i3-migrate-config-to-v4.pl b/i3-migrate-config-to-v4.pl
index 02981457..f4f970df 100755
--- a/i3-migrate-config-to-v4.pl
+++ b/i3-migrate-config-to-v4.pl
@@ -219,6 +219,7 @@ sub convert_command {
         qr/^bn/ => 'border normal',
         qr/^bp/ => 'border 1pixel',
         qr/^bb/ => 'border none',
+        qr/^bt/ => 'border toggle',
         qr/^pw/ => 'workspace prev',
         qr/^nw/ => 'workspace next',
     );
diff --git a/testcases/t/71-config-migrate.t b/testcases/t/71-config-migrate.t
index 1d81aaac..922ddc45 100644
--- a/testcases/t/71-config-migrate.t
+++ b/testcases/t/71-config-migrate.t
@@ -185,6 +185,7 @@ $input = <<EOT;
     bindsym Mod1+s bn
     bindsym Mod1+s bp
     bindsym Mod1+s bb
+    bindsym Mod1+s bt
 
     bindsym Mod1+j wch
     bindsym Mod1+j wcml
@@ -213,6 +214,7 @@ ok(line_exists($output, qr|^bindsym Mod1\+s move right$|), 'ml replaced');
 ok(line_exists($output, qr|^bindsym Mod1\+s border normal$|), 'bn replaced');
 ok(line_exists($output, qr|^bindsym Mod1\+s border 1pixel$|), 'bp replaced');
 ok(line_exists($output, qr|^bindsym Mod1\+s border none$|), 'bb replaced');
+ok(line_exists($output, qr|^bindsym Mod1\+s border toggle$|), 'bt replaced');
 ok(line_exists($output, qr|^#.*with container.*obsolete.*wch$|), 'with container removed');
 ok(line_exists($output, qr|^#.*with container.*obsolete.*wcml$|), 'with container removed');
 ok(line_exists($output, qr|^bindsym Mod1\+k kill$|), 'kill unchanged');