@@ -11,7 +11,7 @@ from logging import debug, info, warning, error

 from .Exceptions import ParameterError

 from .S3Uri import S3UriS3

 from .Utils import (getTextFromXml, getTreeFromXml, formatSize,

-                    calculateChecksum, parseNodes)

+                    calculateChecksum, parseNodes, s3_quote)

 class MultiPartUpload(object):

@@ -262,6 +262,10 @@ class MultiPartUpload(object):

         headers = {

             "x-amz-copy-source": "/%s/%s" % (self.src_uri.bucket(),

                                              self.src_uri.object()),

+            "x-amz-copy-source": s3_quote("/%s/%s" % (self.src_uri.bucket(),

+                                                      self.src_uri.object()),

+                                          quote_backslashes=False,

+                                          unicode_output=True)

         }

         # byte range, with end byte included. A 10 byte file has bytes=0-9

@@ -861,10 +861,10 @@ class S3(object):

                                                 headers, extra_label)

         ## Not multipart...

-        headers['x-amz-copy-source'] = "/%s/%s" % (

-            src_uri.bucket(),

-            urlencode_string(src_uri.object(), unicode_output=True)

-        )

+        headers['x-amz-copy-source'] = s3_quote("/%s/%s" % (src_uri.bucket(),

+                                                            src_uri.object()),

+                                                quote_backslashes=False,

+                                                unicode_output=True)

         headers['x-amz-metadata-directive'] = "COPY"

         request = self.create_request("OBJECT_PUT", uri=dst_uri,

@@ -908,8 +908,10 @@ class S3(object):

                 raise exc

             acl = None

-        headers['x-amz-copy-source'] = "/%s/%s" % (src_uri.bucket(),

-                                                   urlencode_string(src_uri.object(), unicode_output=True))

+        headers['x-amz-copy-source'] = s3_quote("/%s/%s" % (src_uri.bucket(),

+                                                            src_uri.object()),

+                                                quote_backslashes=False,

+                                                unicode_output=True)

         headers['x-amz-metadata-directive'] = "REPLACE"

         # cannot change between standard and reduced redundancy with a REPLACE.