diff --git a/src/verilog.y b/src/verilog.y
index a7750a909..0b3f3ec3f 100644
--- a/src/verilog.y
+++ b/src/verilog.y
@@ -2074,7 +2074,7 @@ instnameParen<cellp>:
 
 instRangeE<rangep>:
 		/* empty */				{ $$ = NULL; }
-	|	'[' constExpr ']'			{ $$ = new AstRange($1,new AstConst($1,0),$2); }
+	|	'[' constExpr ']'			{ $$ = new AstRange($1, new AstConst($1, 0), new AstSub($1, $2, new AstConst($1, 1))); }
 	|	'[' constExpr ':' constExpr ']'		{ $$ = new AstRange($1,$2,$4); }
 	;