1 files changed, 1 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index e8765aea96d..b0dfc498add 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -1043,7 +1043,7 @@ coding_set_destination (struct coding_system *coding)
 {
   if (BUFFERP (coding->dst_object))
     {
-      if (coding->src_pos < 0)
+      if (BUFFERP (coding->src_object) && coding->src_pos < 0)
         {
           coding->destination = BEG_ADDR + coding->dst_pos_byte - BEG_BYTE;
           coding->dst_bytes = (GAP_END_ADDR