diff --git a/vlib/v/ast/ast.v b/vlib/v/ast/ast.v
index daf6015832..fcc16e8352 100644
--- a/vlib/v/ast/ast.v
+++ b/vlib/v/ast/ast.v
@@ -11,9 +11,9 @@ pub type TypeDecl = AliasTypeDecl | FnTypeDecl | SumTypeDecl
 
 pub type Expr = AnonFn | ArrayInit | AsCast | Assoc | BoolLiteral | CallExpr | CastExpr |
 	CharLiteral | ComptimeCall | ConcatExpr | EnumVal | FloatLiteral | Ident | IfExpr | IfGuardExpr |
-	IndexExpr | InfixExpr | IntegerLiteral | Likely | LockExpr | MapInit | MatchExpr | None | OrExpr |
-	ParExpr | PostfixExpr | PrefixExpr | RangeExpr | SelectorExpr | SizeOf | SqlExpr | StringInterLiteral |
-	StringLiteral | StructInit | Type | TypeOf
+	IndexExpr | InfixExpr | IntegerLiteral | Likely | LockExpr | MapInit | MatchExpr | None |
+	OrExpr | ParExpr | PostfixExpr | PrefixExpr | RangeExpr | SelectorExpr | SizeOf | SqlExpr |
+	StringInterLiteral | StringLiteral | StructInit | Type | TypeOf
 
 pub type Stmt = AssertStmt | AssignStmt | Attr | Block | BranchStmt | Comment | CompFor |
 	CompIf | ConstDecl | DeferStmt | EnumDecl | ExprStmt | FnDecl | ForCStmt | ForInStmt |
@@ -586,7 +586,8 @@ pub mut:
 // e.g. `[unsafe_fn]`
 pub struct Attr {
 pub:
-	name string
+	name      string
+	is_string bool // `['xxx']`
 }
 
 pub fn (attrs []Attr) contains(attr Attr) bool {
@@ -902,7 +903,7 @@ pub fn (expr Expr) position() token.Position {
 		AsCast {
 			return expr.pos
 		}
-			// ast.Ident { }
+		// ast.Ident { }
 		CastExpr {
 			return expr.pos
 		}
@@ -930,7 +931,7 @@ pub fn (expr Expr) position() token.Position {
 		IfExpr {
 			return expr.pos
 		}
-			// ast.IfGuardExpr { }
+		// ast.IfGuardExpr { }
 		IndexExpr {
 			return expr.pos
 		}
@@ -961,11 +962,11 @@ pub fn (expr Expr) position() token.Position {
 		PostfixExpr {
 			return expr.pos
 		}
-			// ast.None { }
+		// ast.None { }
 		PrefixExpr {
 			return expr.pos
 		}
-			// ast.ParExpr { }
+		// ast.ParExpr { }
 		SelectorExpr {
 			return expr.pos
 		}
@@ -978,14 +979,14 @@ pub fn (expr Expr) position() token.Position {
 		StringInterLiteral {
 			return expr.pos
 		}
-			// ast.Type { }
+		// ast.Type { }
 		StructInit {
 			return expr.pos
 		}
 		Likely {
 			return expr.pos
 		}
-			// ast.TypeOf { }
+		// ast.TypeOf { }
 		else {
 			return token.Position{}
 		}
@@ -996,29 +997,29 @@ pub fn (stmt Stmt) position() token.Position {
 	match stmt {
 		AssertStmt { return stmt.pos }
 		AssignStmt { return stmt.pos }
-			/*
-			// Attr {
+		/*
+		// Attr {
 		// }
 		// Block {
 		// }
 		// BranchStmt {
 		// }
-			*/
+		*/
 		Comment { return stmt.pos }
 		CompIf { return stmt.pos }
 		ConstDecl { return stmt.pos }
-			/*
-			// DeferStmt {
+		/*
+		// DeferStmt {
 		// }
-			*/
+		*/
 		EnumDecl { return stmt.pos }
 		ExprStmt { return stmt.pos }
 		FnDecl { return stmt.pos }
 		ForCStmt { return stmt.pos }
 		ForInStmt { return stmt.pos }
 		ForStmt { return stmt.pos }
-			/*
-			// GlobalDecl {
+		/*
+		// GlobalDecl {
 		// }
 		// GoStmt {
 		// }
@@ -1028,23 +1029,23 @@ pub fn (stmt Stmt) position() token.Position {
 		// }
 		// HashStmt {
 		// }
-			*/
+		*/
 		Import { return stmt.pos }
-			/*
-			// InterfaceDecl {
+		/*
+		// InterfaceDecl {
 		// }
 		// Module {
 		// }
-			*/
+		*/
 		Return { return stmt.pos }
 		StructDecl { return stmt.pos }
-			/*
-			// TypeDecl {
+		/*
+		// TypeDecl {
 		// }
 		// UnsafeStmt {
 		// }
-			*/
-			//
+		*/
+		//
 		else { return token.Position{} }
 	}
 }
diff --git a/vlib/v/fmt/fmt.v b/vlib/v/fmt/fmt.v
index 6e54d38703..68163157f1 100644
--- a/vlib/v/fmt/fmt.v
+++ b/vlib/v/fmt/fmt.v
@@ -278,7 +278,11 @@ pub fn (mut f Fmt) stmt(node ast.Stmt) {
 			f.writeln('')
 		}
 		ast.Attr {
-			f.writeln('[$node.name]')
+			if node.is_string {
+				f.writeln("['$node.name']")
+			} else {
+				f.writeln('[$node.name]')
+			}
 		}
 		ast.Block {
 			f.writeln('{')
@@ -1375,8 +1379,7 @@ pub fn (mut f Fmt) match_expr(it ast.MatchExpr) {
 
 pub fn (mut f Fmt) remove_new_line() {
 	mut i := 0
-	for i = f.out.len - 1; i >= 0; i--
-	 {
+	for i = f.out.len - 1; i >= 0; i-- {
 		if !f.out.buf[i].is_space() { // != `\n` {
 			break
 		}
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index c0cd23783d..38c2861307 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -656,7 +656,8 @@ fn (mut p Parser) parse_attr() ast.Attr {
 		is_if_attr = true
 	}
 	mut name := ''
-	if p.tok.kind == .string {
+	is_string := p.tok.kind == .string
+	if is_string {
 		name = p.tok.lit
 		p.next()
 	} else {
@@ -677,6 +678,7 @@ fn (mut p Parser) parse_attr() ast.Attr {
 	}
 	return ast.Attr{
 		name: name
+		is_string: is_string
 	}
 }