1 files changed, 2 insertions, 0 deletions

diff --git a/src/lread.c b/src/lread.c
index c336c6db6e1..854aaa784ad 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -3913,6 +3913,8 @@ read_stack_reset (intmax_t sp)
 
 #define READ_AND_BUFFER(c)                      \
   c = READCHAR;                                 \
+  if (c < 0)                                    \
+    INVALID_SYNTAX_WITH_BUFFER ();              \
   if (multibyte)                                \
     p += CHAR_STRING (c, (unsigned char *) p);  \
   else                                          \