diff --git a/sql/sql_const.h b/sql/sql_const.h
index acbddcbf76e..ef61a592e81 100644
--- a/sql/sql_const.h
+++ b/sql/sql_const.h
@@ -29,7 +29,7 @@
 /* extra 4+4 bytes for slave tmp tables */
 #define MAX_DBKEY_LENGTH (NAME_LEN*2+1+1+4+4)
 #define MAX_ALIAS_NAME 256
-#define MAX_FIELD_NAME (NAME_LEN+1)			/* Max colum name length +2 */
+#define MAX_FIELD_NAME (NAME_LEN+1)			/* Max colum name length +1 */
 #define MAX_SYS_VAR_LENGTH 32
 #define MAX_KEY MAX_INDEXES                     /* Max used keys */
 #define MAX_REF_PARTS 32			/* Max parts used as ref */