diff --git a/src/bin/pgbench/exprparse.y b/src/bin/pgbench/exprparse.y
index 8772448..04f2529 100644
--- a/src/bin/pgbench/exprparse.y
+++ b/src/bin/pgbench/exprparse.y
@@ -47,11 +47,11 @@ static PgBenchExpr *make_func(yyscan_t yyscanner, int fnumber, PgBenchExprList *
 
 %type <elist> elist
 %type <expr> expr
-%type <ival> INTEGER function
-%type <dval> DOUBLE
+%type <ival> INTEGER_VAR function
+%type <dval> DOUBLE_VAR
 %type <str> VARIABLE FUNCTION
 
-%token INTEGER DOUBLE VARIABLE FUNCTION
+%token INTEGER_VAR DOUBLE_VAR VARIABLE FUNCTION
 
 /* Precedence: lowest to highest */
 %left	'+' '-'
@@ -76,8 +76,8 @@ expr: '(' expr ')'			{ $$ = $2; }
 	| expr '*' expr			{ $$ = make_op(yyscanner, "*", $1, $3); }
 	| expr '/' expr			{ $$ = make_op(yyscanner, "/", $1, $3); }
 	| expr '%' expr			{ $$ = make_op(yyscanner, "%", $1, $3); }
-	| INTEGER				{ $$ = make_integer_constant($1); }
-	| DOUBLE				{ $$ = make_double_constant($1); }
+	| INTEGER_VAR			{ $$ = make_integer_constant($1); }
+	| DOUBLE_VAR			{ $$ = make_double_constant($1); }
 	| VARIABLE 				{ $$ = make_variable($1); }
 	| function '(' elist ')' { $$ = make_func(yyscanner, $1, $3); }
 	;
diff --git a/src/bin/pgbench/exprscan.l b/src/bin/pgbench/exprscan.l
index d8b706a..e954608 100644
--- a/src/bin/pgbench/exprscan.l
+++ b/src/bin/pgbench/exprscan.l
@@ -123,12 +123,12 @@ newline			[\n]
 				}
 {digit}+		{
 					yylval->ival = strtoint64(yytext);
-					return INTEGER;
+					return INTEGER_VAR;
 				}
 {digit}+(\.{digit}*)?([eE][-+]?{digit}+)?	{
 					yycolumn += yyleng;
 					yylval->dval = atof(yytext);
-					return DOUBLE;
+					return DOUBLE_VAR;
 				}
 {alpha}{alnum}*	{
 					yylval->str = pg_strdup(yytext);
diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index a2df4df..4cd5513 100644
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -1043,7 +1043,7 @@ coerceToInt(PgBenchValue *pval, int64 *ival)
 	{
 		double dval = pval->u.dval;
 		Assert(pval->type == PGBT_DOUBLE);
-		if (dval < INT64_MIN || INT64_MAX < dval)
+		if (dval < PG_INT64_MIN || PG_INT64_MAX < dval)
 		{
 			fprintf(stderr, "double to int overflow for %f\n", dval);
 			return false;