diff --git a/ext/curl/gstcurlhttpsink.c b/ext/curl/gstcurlhttpsink.c
index 3df2555743..657a40d682 100644
--- a/ext/curl/gstcurlhttpsink.c
+++ b/ext/curl/gstcurlhttpsink.c
@@ -466,7 +466,16 @@ gst_curl_http_sink_set_mime_type (GstCurlBaseSink * bcsink, GstCaps * caps)
 
   structure = gst_caps_get_structure (caps, 0);
   mime_type = gst_structure_get_name (structure);
-  sink->content_type = g_strdup (mime_type);
+
+  if (!g_strcmp0 (mime_type, "multipart/form-data") &&
+      gst_structure_has_field_typed (structure, "boundary", G_TYPE_STRING)) {
+    const gchar *boundary;
+
+    boundary = gst_structure_get_string (structure, "boundary");
+    sink->content_type = g_strconcat (mime_type, "; boundary=", boundary, NULL);
+  } else {
+    sink->content_type = g_strdup (mime_type);
+  }
 }
 
 static gboolean