diff --git a/Tests/LibWeb/Text/expected/Streams/ByteLengthQueuingStrategy-enqueue-desired-size.txt b/Tests/LibWeb/Text/expected/Streams/ByteLengthQueuingStrategy-enqueue-desired-size.txt
new file mode 100644
index 00000000000..a3efdeb89e4
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/Streams/ByteLengthQueuingStrategy-enqueue-desired-size.txt
@@ -0,0 +1,4 @@
+5
+2
+-5
+-6
diff --git a/Tests/LibWeb/Text/input/Streams/ByteLengthQueuingStrategy-enqueue-desired-size.html b/Tests/LibWeb/Text/input/Streams/ByteLengthQueuingStrategy-enqueue-desired-size.html
new file mode 100644
index 00000000000..2bb07ecc450
--- /dev/null
+++ b/Tests/LibWeb/Text/input/Streams/ByteLengthQueuingStrategy-enqueue-desired-size.html
@@ -0,0 +1,22 @@
+<script src="../include.js"></script>
+<script>
+    test(() => {
+        let controller;
+        new ReadableStream(
+            {
+                start(c) {
+                    controller = c;
+                }
+            },
+            new ByteLengthQueuingStrategy({ highWaterMark: 5 })
+        );
+
+        println(controller.desiredSize);
+        controller.enqueue(new Uint8Array([1, 2, 3]));
+        println(controller.desiredSize);
+        controller.enqueue(new Uint8Array([1, 2, 3, 4, 5, 6, 7]));
+        println(controller.desiredSize);
+        controller.enqueue(new Uint8Array([1]));
+        println(controller.desiredSize);
+    });
+</script>