1 files changed, 5 insertions, 2 deletions

diff --git a/src/w32image.c b/src/w32image.c
index 6daf42c1916..e71471f4a7c 100644
--- a/src/w32image.c
+++ b/src/w32image.c
@@ -631,7 +631,8 @@ Return non-nil if thumbnail creation succeeds, nil otherwise.  */)
 
   /* Create an image by reading from INPUT_FILE.  */
   wchar_t input_file_w[MAX_PATH];
-  input_file = ENCODE_FILE (Fexpand_file_name (input_file, Qnil));
+  input_file
+    = ENCODE_FILE (Fexpand_file_name (Fcopy_sequence (input_file), Qnil));
   unixtodos_filename (SSDATA (input_file));
   filename_to_utf16 (SSDATA (input_file), input_file_w);
   GpImage *file_image;
@@ -652,7 +653,9 @@ Return non-nil if thumbnail creation succeeds, nil otherwise.  */)
         {
           /* Save the thumbnail image to a file of specified TYPE.  */
           wchar_t thumb_file_w[MAX_PATH];
-          thumb_file = ENCODE_FILE (Fexpand_file_name (thumb_file, Qnil));
+          thumb_file
+            = ENCODE_FILE (Fexpand_file_name (Fcopy_sequence (thumb_file),
+                                              Qnil));
           unixtodos_filename (SSDATA (thumb_file));
           filename_to_utf16 (SSDATA (thumb_file), thumb_file_w);
           status = GdipSaveImageToFile (thumb_image, thumb_file_w,