diff --git a/slackclient/_slackrequest.py b/slackclient/_slackrequest.py
index 096054476..d16c6b30d 100644
--- a/slackclient/_slackrequest.py
+++ b/slackclient/_slackrequest.py
@@ -8,7 +8,14 @@ def do(token, request="?", post_data=None, domain="slack.com"):
         if post_data is None:
             post_data = {}
 
-        return requests.post(
+        if "files" in post_data:
+            temp = dict([(element, post_data[element]) for element in post_data if not "files" in element])
+            return requests.post(
             'https://{0}/api/{1}'.format(domain, request),
-            data=dict(post_data, token=token),
-        )
+            data=dict(temp, token=token), files=post_data["files"]
+            )
+        else:
+            return requests.post(
+                'https://{0}/api/{1}'.format(domain, request),
+                data=dict(post_data, token=token),
+            )