1 files changed, 3 insertions, 1 deletions

diff --git a/src/coding.c b/src/coding.c
index 5985e895ef6..385481d1a63 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -872,7 +872,7 @@ decode_composition_emacs_mule (coding, src, src_end,
           component[ncomponent] = c;
         }
     }
-  else
+  else if (c >= 0x80)
     {
       /* This may be an old Emacs 20 style format.  See the comment at
          the section 2 of this file.  */
@@ -924,6 +924,8 @@ decode_composition_emacs_mule (coding, src, src_end,
       else
         return 0;
     }
+  else
+    return 0;
 
   if (buf == bufp || dst + (bufp - buf) <= (dst_bytes ? dst_end : src))
     {