diff --git a/test/parallel/test-streams-highwatermark.js b/test/parallel/test-streams-highwatermark.js
index 2228c12f1421f5..5e27a761350810 100644
--- a/test/parallel/test-streams-highwatermark.js
+++ b/test/parallel/test-streams-highwatermark.js
@@ -59,3 +59,16 @@ const { inspect } = require('util');
   readable._read = common.mustCall();
   readable.read(0);
 }
+
+{
+  // Parse size as decimal integer
+  ['1', '1.0', 1].forEach((size) => {
+    const readable = new stream.Readable({
+      read: common.mustCall(),
+      highWaterMark: 0,
+    });
+    readable.read(size);
+
+    assert.strictEqual(readable._readableState.highWaterMark, Number(size));
+  });
+}