1 files changed, 6 insertions, 0 deletions

diff --git a/src/coding.c b/src/coding.c
index dc99354e157..d32a35f31fb 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -3946,6 +3946,9 @@ shrink_decoding_region (beg, end, coding, str)
       break;
 
     default:            /* i.e. case coding_type_iso2022: */
+      if (CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, 0) != CHARSET_ASCII)
+        /* We can't skip any data.  */
+        break;
       if (coding->heading_ascii < 0)
         {
           /* We can skip all ASCII characters at the head except for a
@@ -4087,6 +4090,9 @@ shrink_encoding_region (beg, end, coding, str)
       break;
 
     case coding_type_iso2022:
+      if (CODING_SPEC_ISO_INITIAL_DESIGNATION (coding, 0) != CHARSET_ASCII)
+        /* We can't skip any data.  */
+        break;
       if (coding->flags & CODING_FLAG_ISO_DESIGNATE_AT_BOL)
         {
           unsigned char *bol = begp;