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-rw-r--r--src/bytecode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/bytecode.c b/src/bytecode.c
index 4ea3cbfb12b..c6766a38cf2 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -313,7 +313,7 @@ enum byte_code_op
/* Update the thread's bytecode offset, just before NEXT. */
-#define UPDATE_OFFSET (backtrace_byte_offset = pc - bytestr_data)
+#define UPDATE_OFFSET (backtrace_byte_offset = pc - bytestr_data - 1)
DEFUN ("byte-code", Fbyte_code, Sbyte_code, 3, 3, 0,
doc: /* Function used internally in byte-compiled code.