diff --git a/pkg/handler/get_test.go b/pkg/handler/get_test.go
index d69ff3f..b1d638a 100644
--- a/pkg/handler/get_test.go
+++ b/pkg/handler/get_test.go
@@ -143,7 +143,7 @@ func TestGet(t *testing.T) {
 			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
 				Offset: 0,
 				MetaData: map[string]string{
-					"filetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+					"filetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document.v1",
 					"filename": "invoice.docx",
 				},
 			}, nil),
@@ -158,7 +158,7 @@ func TestGet(t *testing.T) {
 			URL:    "yes",
 			ResHeader: map[string]string{
 				"Content-Length":      "0",
-				"Content-Type":        "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+				"Content-Type":        "application/vnd.openxmlformats-officedocument.wordprocessingml.document.v1",
 				"Content-Disposition": `attachment;filename="invoice.docx"`,
 			},
 			Code:    http.StatusNoContent,
diff --git a/pkg/handler/unrouted_handler.go b/pkg/handler/unrouted_handler.go
index b90cd67..c8db15e 100644
--- a/pkg/handler/unrouted_handler.go
+++ b/pkg/handler/unrouted_handler.go
@@ -23,7 +23,7 @@ var (
 	reExtractFileID  = regexp.MustCompile(`([^/]+)\/?$`)
 	reForwardedHost  = regexp.MustCompile(`host=([^,]+)`)
 	reForwardedProto = regexp.MustCompile(`proto=(https?)`)
-	reMimeType       = regexp.MustCompile(`^[a-z]+\/[a-z\-\+\.]+$`)
+	reMimeType       = regexp.MustCompile(`^[a-z]+\/[a-z0-9\-\+\.]+$`)
 )
 
 // HTTPError represents an error with an additional status code attached