diff --git a/library/Requests/Transport/cURL.php b/library/Requests/Transport/cURL.php
index 4429edb64..d252b2b89 100644
--- a/library/Requests/Transport/cURL.php
+++ b/library/Requests/Transport/cURL.php
@@ -313,6 +313,11 @@ protected function setup_handle($url, $headers, $data, $options) {
 		if ( ! isset( $headers['Connection'] ) ) {
 			$headers['Connection'] = 'close';
 		}
+		if(isset($headers['Content-Type']) && $headers['Content-Type']==='multipart/form-data') {
+			$is_multipart_form = true;
+		}
+		else
+			$is_multipart_form = false;
 
 		$headers = Requests::flatten($headers);
 
@@ -323,7 +328,7 @@ protected function setup_handle($url, $headers, $data, $options) {
 				$url = self::format_get($url, $data);
 				$data = '';
 			}
-			elseif (!is_string($data)) {
+			elseif (!is_string($data) && !$is_multipart_form) {
 				$data = http_build_query($data, null, '&');
 			}
 		}
diff --git a/library/Requests/Transport/fsockopen.php b/library/Requests/Transport/fsockopen.php
index c7c61d3b1..d6966d7d8 100644
--- a/library/Requests/Transport/fsockopen.php
+++ b/library/Requests/Transport/fsockopen.php
@@ -154,7 +154,20 @@ public function request($url, $headers = array(), $data = array(), $options = ar
 
 		if ($options['type'] !== Requests::TRACE) {
 			if (is_array($data)) {
-				$request_body = http_build_query($data, null, '&');
+				if (isset($case_insensitive_headers['Content-Type']) && $case_insensitive_headers['Content-Type']==='multipart/form-data')
+				{
+					$boundary = '------------------------'.substr(md5(rand()), 0, 16);
+					$headers['Content-Type'] = sprintf('multipart/form-data; boundary=%s', $boundary);
+
+					foreach ($data as $key=>$value)
+					{
+						$request_body .= '--'.$boundary."\r\n";
+						$request_body .= sprintf("Content-Disposition: form-data; name=\"%s\"\r\n\r\n%s\r\n", $key, $value);
+					}
+					$request_body .= '--'.$boundary."--\r\n";
+				}
+				else
+					$request_body = http_build_query($data, null, '&');
 			}
 			else {
 				$request_body = $data;
diff --git a/tests/Transport/Base.php b/tests/Transport/Base.php
index ebd6ca98a..f8484e4fe 100644
--- a/tests/Transport/Base.php
+++ b/tests/Transport/Base.php
@@ -203,6 +203,17 @@ public function testPOSTWithNestedData() {
 		$this->assertEquals(array('test' => 'true', 'test2[test3]' => 'test', 'test2[test4]' => 'test-too'), $result['form']);
 	}
 
+	public function testPOSTWithMultipartData() {
+		$data = array(
+			'test' => 'true',
+			'test2' => 'test',
+		);
+		$request = Requests::post('http://httpbin.org/post', array('Content-Type'=>'multipart/form-data'), $data, $this->getOptions());
+		$this->assertEquals(200, $request->status_code);
+		$result = json_decode($request->body, true);
+		$this->assertEquals(array('test' => 'true', 'test2' => 'test'), $result['form']);
+	}
+
 	public function testRawPUT() {
 		$data = 'test';
 		$request = Requests::put(httpbin('/put'), array(), $data, $this->getOptions());