diff --git a/std/http/_io.ts b/std/http/_io.ts
index b7efaf8e53..4ff3dd4e6b 100644
--- a/std/http/_io.ts
+++ b/std/http/_io.ts
@@ -346,7 +346,7 @@ export async function readRequest(
   req.conn = conn;
   req.r = bufr;
   [req.method, req.url, req.proto] = firstLine.split(" ", 3);
-  [req.protoMinor, req.protoMajor] = parseHTTPVersion(req.proto);
+  [req.protoMajor, req.protoMinor] = parseHTTPVersion(req.proto);
   req.headers = headers;
   fixLength(req);
   return req;
diff --git a/std/http/_io_test.ts b/std/http/_io_test.ts
index 14675a799c..7c1a80a2fc 100644
--- a/std/http/_io_test.ts
+++ b/std/http/_io_test.ts
@@ -407,6 +407,11 @@ Deno.test("testReadRequestError", async function (): Promise<void> {
       in: "GET / HTTP/1.1\r\nheader:foo\r\n",
       err: Deno.errors.UnexpectedEof,
     },
+    {
+      in: "POST / HTTP/1.0\r\n\r\n",
+      headers: [],
+      version: true,
+    },
     { in: "", eof: true },
     {
       in: "HEAD / HTTP/1.1\r\nContent-Length:4\r\n\r\n",
@@ -472,6 +477,12 @@ Deno.test("testReadRequestError", async function (): Promise<void> {
       assert(err instanceof (test.err as typeof Deno.errors.UnexpectedEof));
     } else {
       assert(req instanceof ServerRequest);
+      if (test.version) {
+        // return value order of parseHTTPVersion() function have to match with [req.protoMajor, req.protoMinor];
+        const version = parseHTTPVersion(test.in.split(" ", 3)[2]);
+        assertEquals(req.protoMajor, version[0]);
+        assertEquals(req.protoMinor, version[1]);
+      }
       assert(test.headers);
       assertEquals(err, undefined);
       assertNotEquals(req, null);