diff --git a/src/dsql/parse.y b/src/dsql/parse.y
index 96fd450391..d336c9a789 100644
--- a/src/dsql/parse.y
+++ b/src/dsql/parse.y
@@ -4717,7 +4717,7 @@ substring_function	: SUBSTRING '(' value FROM value string_length_opt ')'
 string_length_opt	: FOR value
 			{ $$ = $2; }
 		|
-			{ $$ = MAKE_const_slong (SHRT_POS_MAX); }
+			{ $$ = MAKE_const_slong (LONG_POS_MAX); }
 		;
 
 trim_function	: TRIM '(' trim_specification value FROM value ')'