diff --git a/src/buffer/unicode.zig b/src/buffer/unicode.zig
index fd13e91d..fc78be54 100644
--- a/src/buffer/unicode.zig
+++ b/src/buffer/unicode.zig
@@ -208,10 +208,10 @@ pub fn toggle_case(allocator: std.mem.Allocator, text: []const u8) TransformErro
     const view: Utf8View = .initUnchecked(text);
     var it = view.iterator();
     while (it.nextCodepoint()) |cp| {
-        const cp_ = if (uucode.get(.is_lowercase, cp))
-            uucode.get(.simple_uppercase_mapping, cp) orelse cp
+        const cp_ = if (uucode.get(.changes_when_lowercased, cp))
+            uucode.get(.simple_lowercase_mapping, cp) orelse cp
         else
-            uucode.get(.simple_lowercase_mapping, cp) orelse cp;
+            uucode.get(.simple_uppercase_mapping, cp) orelse cp;
         var utf8_buf: [6]u8 = undefined;
         const size = try utf8Encode(cp_, &utf8_buf);
         try writer.writeAll(utf8_buf[0..size]);