1 files changed, 2 insertions, 0 deletions

diff --git a/src/coding.c b/src/coding.c
index e292f808597..869a2715640 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -6654,6 +6654,8 @@ decode_coding (coding)
              that the number of data is less than the size of
              coding->charbuf.  */
           coding->charbuf_used = 0;
+          coding->chars_at_source = 0;
+
           while (nbytes-- > 0)
             {
               int c = *src++;