diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 19d85c495..866d85822 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -8,6 +8,7 @@ import (
 	"io"
 	"io/ioutil"
 	"net/http"
+	"net/url"
 	"sort"
 	"strings"
 
@@ -69,7 +70,7 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 			return
 		}
 	} else {
-		uploadUrl := fmt.Sprintf("http://%s%s/%s%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+		uploadUrl := s3a.buildUploadUrl(bucket, object)
 
 		etag, errCode := s3a.putToFiler(r, uploadUrl, dataReader)
 
@@ -84,6 +85,15 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 	writeSuccessResponseEmpty(w)
 }
 
+func (s3a *S3ApiServer) buildUploadUrl(bucket string, object string) string {
+	var escapedParts []string
+	for _, part := range strings.Split(object, "/") {
+		escapedParts = append(escapedParts, url.PathEscape(part))
+	}
+	object = strings.Join(escapedParts, "/")
+	return fmt.Sprintf("http://%s%s/%s%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+}
+
 func (s3a *S3ApiServer) GetObjectHandler(w http.ResponseWriter, r *http.Request) {
 
 	bucket, object := getBucketAndObject(r)
diff --git a/weed/s3api/s3api_object_handlers_postpolicy.go b/weed/s3api/s3api_object_handlers_postpolicy.go
index 044e732db..383eac943 100644
--- a/weed/s3api/s3api_object_handlers_postpolicy.go
+++ b/weed/s3api/s3api_object_handlers_postpolicy.go
@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"encoding/base64"
 	"errors"
-	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/s3api/policy"
 	"github.com/chrislusf/seaweedfs/weed/s3api/s3err"
 	"github.com/dustin/go-humanize"
@@ -110,7 +109,7 @@ func (s3a *S3ApiServer) PostPolicyBucketHandler(w http.ResponseWriter, r *http.R
 		}
 	}
 
-	uploadUrl := fmt.Sprintf("http://%s%s/%s/%s", s3a.option.Filer, s3a.option.BucketsPath, bucket, object)
+	uploadUrl := s3a.buildUploadUrl(bucket, object)
 
 	etag, errCode := s3a.putToFiler(r, uploadUrl, fileBody)