diff --git a/src/Io/MultipartParser.php b/src/Io/MultipartParser.php
index 47422009..0c196f97 100644
--- a/src/Io/MultipartParser.php
+++ b/src/Io/MultipartParser.php
@@ -68,7 +68,7 @@ final class MultipartParser
     private $emptyCount = 0;
 
     /**
-     * @param int|null $uploadMaxFilesize
+     * @param int|string|null $uploadMaxFilesize
      * @param int|null $maxFileUploads
      */
     public function __construct($uploadMaxFilesize = null, $maxFileUploads = null)
@@ -83,10 +83,10 @@ public function __construct($uploadMaxFilesize = null, $maxFileUploads = null)
         }
 
         if ($uploadMaxFilesize === null) {
-            $uploadMaxFilesize = IniUtil::iniSizeToBytes(ini_get('upload_max_filesize'));
+            $uploadMaxFilesize = ini_get('upload_max_filesize');
         }
 
-        $this->uploadMaxFilesize = (int)$uploadMaxFilesize;
+        $this->uploadMaxFilesize = IniUtil::iniSizeToBytes($uploadMaxFilesize);
         $this->maxFileUploads = $maxFileUploads === null ? (ini_get('file_uploads') === '' ? 0 : (int)ini_get('max_file_uploads')) : (int)$maxFileUploads;
     }
 
diff --git a/src/Middleware/RequestBodyBufferMiddleware.php b/src/Middleware/RequestBodyBufferMiddleware.php
index 7ef2503b..503bc9fd 100644
--- a/src/Middleware/RequestBodyBufferMiddleware.php
+++ b/src/Middleware/RequestBodyBufferMiddleware.php
@@ -14,18 +14,19 @@ final class RequestBodyBufferMiddleware
     private $sizeLimit;
 
     /**
-     * @param int|null $sizeLimit Either an int with the max request body size
-     *                            or null to use post_max_size from PHP's
-     *                            configuration. (Note that the value from
-     *                            the CLI configuration will be used.)
+     * @param int|string|null $sizeLimit Either an int with the max request body size
+     *                                   in bytes or an ini like size string
+     *                                   or null to use post_max_size from PHP's
+     *                                   configuration. (Note that the value from
+     *                                   the CLI configuration will be used.)
      */
     public function __construct($sizeLimit = null)
     {
         if ($sizeLimit === null) {
-            $sizeLimit = IniUtil::iniSizeToBytes(ini_get('post_max_size'));
+            $sizeLimit = ini_get('post_max_size');
         }
 
-        $this->sizeLimit = $sizeLimit;
+        $this->sizeLimit = IniUtil::iniSizeToBytes($sizeLimit);
     }
 
     public function __invoke(ServerRequestInterface $request, $stack)
diff --git a/src/Middleware/RequestBodyParserMiddleware.php b/src/Middleware/RequestBodyParserMiddleware.php
index 63759642..005c28cd 100644
--- a/src/Middleware/RequestBodyParserMiddleware.php
+++ b/src/Middleware/RequestBodyParserMiddleware.php
@@ -10,7 +10,7 @@ final class RequestBodyParserMiddleware
     private $multipart;
 
     /**
-     * @param int|null $uploadMaxFilesize
+     * @param int|string|null $uploadMaxFilesize
      * @param int|null $maxFileUploads
      */
     public function __construct($uploadMaxFilesize = null, $maxFileUploads = null)
diff --git a/tests/Io/MultipartParserTest.php b/tests/Io/MultipartParserTest.php
index b070c93b..45ac0c4d 100644
--- a/tests/Io/MultipartParserTest.php
+++ b/tests/Io/MultipartParserTest.php
@@ -721,6 +721,39 @@ public function testUploadTooLargeFile()
         $this->assertSame(UPLOAD_ERR_INI_SIZE, $file->getError());
     }
 
+    public function testUploadTooLargeFileWithIniLikeSize()
+    {
+        $boundary = "---------------------------12758086162038677464950549563";
+
+        $data  = "--$boundary\r\n";
+        $data .= "Content-Disposition: form-data; name=\"file\"; filename=\"hello\"\r\n";
+        $data .= "Content-type: text/plain\r\n";
+        $data .= "\r\n";
+        $data .= str_repeat('world', 1024) . "\r\n";
+        $data .= "--$boundary--\r\n";
+
+        $request = new ServerRequest('POST', 'http://example.com/', array(
+            'Content-Type' => 'multipart/form-data; boundary=' . $boundary,
+        ), $data, 1.1);
+
+        $parser = new MultipartParser('1K');
+        $parsedRequest = $parser->parse($request);
+
+        $files = $parsedRequest->getUploadedFiles();
+
+        $this->assertCount(1, $files);
+        $this->assertTrue(isset($files['file']));
+        $this->assertInstanceOf('Psr\Http\Message\UploadedFileInterface', $files['file']);
+
+        /* @var $file \Psr\Http\Message\UploadedFileInterface */
+        $file = $files['file'];
+
+        $this->assertSame('hello', $file->getClientFilename());
+        $this->assertSame('text/plain', $file->getClientMediaType());
+        $this->assertSame(5120, $file->getSize());
+        $this->assertSame(UPLOAD_ERR_INI_SIZE, $file->getError());
+    }
+
     public function testUploadNoFile()
     {
         $boundary = "---------------------------12758086162038677464950549563";
diff --git a/tests/Middleware/RequestBodyBufferMiddlewareTest.php b/tests/Middleware/RequestBodyBufferMiddlewareTest.php
index 91bd14cc..913a733f 100644
--- a/tests/Middleware/RequestBodyBufferMiddlewareTest.php
+++ b/tests/Middleware/RequestBodyBufferMiddlewareTest.php
@@ -46,7 +46,7 @@ public function testAlreadyBufferedResolvesImmediately()
     {
         $size = 1024;
         $body = str_repeat('x', $size);
-        $stream = new BufferStream($size);
+        $stream = new BufferStream(1024);
         $stream->write($body);
         $serverRequest = new ServerRequest(
             'GET',
@@ -93,6 +93,33 @@ function (ServerRequestInterface $request) {
         $this->assertSame('', $response->getBody()->getContents());
     }
 
+    public function testKnownExcessiveSizedWithIniLikeSize()
+    {
+        $loop = Factory::create();
+
+        $stream = new ThroughStream();
+        $loop->addTimer(0.001, function () use ($stream) {
+            $stream->end(str_repeat('a', 2048));
+        });
+        $serverRequest = new ServerRequest(
+            'GET',
+            'https://example.com/',
+            array(),
+            new HttpBodyStream($stream, 2048)
+        );
+
+        $buffer = new RequestBodyBufferMiddleware('1K');
+        $response = Block\await($buffer(
+            $serverRequest,
+            function (ServerRequestInterface $request) {
+                return new Response(200, array(), $request->getBody()->getContents());
+            }
+        ), $loop);
+
+        $this->assertSame(200, $response->getStatusCode());
+        $this->assertSame('', $response->getBody()->getContents());
+    }
+
     public function testAlreadyBufferedExceedingSizeResolvesImmediatelyWithEmptyBody()
     {
         $serverRequest = new ServerRequest(