diff --git a/drive/drive.go b/drive/drive.go
index a819dac02..ae43e7150 100644
--- a/drive/drive.go
+++ b/drive/drive.go
@@ -10,9 +10,7 @@ package drive
 import (
 	"fmt"
 	"io"
-	"mime"
 	"net/http"
-	"path"
 	"strings"
 	"sync"
 	"time"
@@ -705,20 +703,13 @@ func (f *FsDrive) Put(in io.Reader, remote string, modTime time.Time, size int64
 		return o, fmt.Errorf("Couldn't find or make directory: %s", err)
 	}
 
-	// Guess the mime type
-	mimeType := mime.TypeByExtension(path.Ext(o.remote))
-	if mimeType == "" {
-		mimeType = "application/octet-stream"
-	}
-	modifiedDate := modTime.Format(timeFormatOut)
-
 	// Define the metadata for the file we are going to create.
 	createInfo := &drive.File{
 		Title:        leaf,
 		Description:  leaf,
 		Parents:      []*drive.ParentReference{{Id: directoryId}},
-		MimeType:     mimeType,
-		ModifiedDate: modifiedDate,
+		MimeType:     fs.MimeType(o),
+		ModifiedDate: modTime.Format(timeFormatOut),
 	}
 
 	// Make the API request to upload metadata and file data.
diff --git a/fs/operations.go b/fs/operations.go
index db58769a3..b80f1ec79 100644
--- a/fs/operations.go
+++ b/fs/operations.go
@@ -5,6 +5,8 @@ package fs
 import (
 	"fmt"
 	"io"
+	"mime"
+	"path"
 	"sync"
 )
 
@@ -97,6 +99,15 @@ func Equal(src, dst Object) bool {
 	return true
 }
 
+// Returns a guess at the mime type from the extension
+func MimeType(o Object) string {
+	mimeType := mime.TypeByExtension(path.Ext(o.Remote()))
+	if mimeType == "" {
+		mimeType = "application/octet-stream"
+	}
+	return mimeType
+}
+
 // Used to remove a failed copy
 func removeFailedCopy(dst Object) {
 	if dst != nil {
diff --git a/googlecloudstorage/googlecloudstorage.go b/googlecloudstorage/googlecloudstorage.go
index a49aa3cdd..67c977143 100644
--- a/googlecloudstorage/googlecloudstorage.go
+++ b/googlecloudstorage/googlecloudstorage.go
@@ -17,7 +17,6 @@ import (
 	"encoding/hex"
 	"fmt"
 	"io"
-	"mime"
 	"net/http"
 	"path"
 	"regexp"
@@ -549,16 +548,10 @@ func (o *FsObjectStorage) Open() (in io.ReadCloser, err error) {
 //
 // The new object may have been created if an error is returned
 func (o *FsObjectStorage) Update(in io.Reader, modTime time.Time, size int64) error {
-	// Guess the content type
-	contentType := mime.TypeByExtension(path.Ext(o.remote))
-	if contentType == "" {
-		contentType = "application/octet-stream"
-	}
-
 	object := storage.Object{
 		Bucket:      o.storage.bucket,
 		Name:        o.storage.root + o.remote,
-		ContentType: contentType,
+		ContentType: fs.MimeType(o),
 		Size:        uint64(size),
 		Updated:     modTime.Format(timeFormatOut), // Doesn't get set
 		Metadata:    metadataFromModTime(modTime),
diff --git a/s3/s3.go b/s3/s3.go
index 13176991d..207c8b707 100644
--- a/s3/s3.go
+++ b/s3/s3.go
@@ -7,7 +7,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"mime"
 	"net/http"
 	"path"
 	"regexp"
@@ -536,13 +535,7 @@ func (o *FsObjectS3) Update(in io.Reader, modTime time.Time, size int64) error {
 		metaMtime: swift.TimeToFloatString(modTime),
 	}
 
-	// Guess the content type
-	contentType := mime.TypeByExtension(path.Ext(o.remote))
-	if contentType == "" {
-		contentType = "application/octet-stream"
-	}
-
-	_, err := o.s3.b.PutReaderHeaders(o.s3.root+o.remote, in, size, contentType, o.s3.perm, headers)
+	_, err := o.s3.b.PutReaderHeaders(o.s3.root+o.remote, in, size, fs.MimeType(o), o.s3.perm, headers)
 	if err != nil {
 		return err
 	}