1 files changed, 2 insertions, 1 deletions
diff --git a/include/myisam.h b/include/myisam.h
index d50b1dc360e..186b049b32e 100644
--- a/include/myisam.h
+++ b/include/myisam.h
@@ -330,7 +330,8 @@ typedef struct st_sort_info
   my_off_t filelength, dupp, buff_length;
   ha_rows max_records;
   uint current_key, total_keys;
-  uint got_error, threads_running;
+  volatile uint got_error;
+  uint threads_running;
   myf myf_rw;
   enum data_file_type new_data_file_type;
 } MI_SORT_INFO;