1 files changed, 1 insertions, 1 deletions

diff --git a/src/doprnt.c b/src/doprnt.c
index 7bcb6741677..3fd6222c9d7 100644
--- a/src/doprnt.c
+++ b/src/doprnt.c
@@ -240,7 +240,7 @@ doprnt1 (lispstrings, buffer, bufsize, format, format_end, nargs, args)
               if (lispstrings)
                 {
                   string = ((struct Lisp_String *)args[cnt])->data;
-                  tem = ((struct Lisp_String *)args[cnt])->size;
+                  tem = STRING_BYTES ((struct Lisp_String *)args[cnt]);
                   cnt++;
                 }
               else