diff --git a/lib/std/http/WebSocket.zig b/lib/std/http/WebSocket.zig
index ad513fddf8af43b259226efabfb68398729a7a48..08bc420b6789c530dc011b2c1bee88f64033d113 100644
--- a/lib/std/http/WebSocket.zig
+++ b/lib/std/http/WebSocket.zig
@@ -30,7 +30,7 @@ pub fn init(
         if (std.ascii.eqlIgnoreCase(header.name, "sec-websocket-key")) {
             sec_websocket_key = header.value;
         } else if (std.ascii.eqlIgnoreCase(header.name, "upgrade")) {
-            if (!std.mem.eql(u8, header.value, "websocket"))
+            if (!std.ascii.eqlIgnoreCase(header.value, "websocket"))
                 return false;
             upgrade_websocket = true;
         }