diff --git a/vlib/compiler/expression.v b/vlib/compiler/expression.v
index 4ff7531caa..f0f37df7a4 100644
--- a/vlib/compiler/expression.v
+++ b/vlib/compiler/expression.v
@@ -437,9 +437,9 @@ fn (p mut Parser) expression() string {
 			p.error('strings only support `+` operator')
 		}	
 		expr_type := p.term()
-		if (tok_op in [.pipe, .amp]) && !(is_integer_type(expr_type) &&
+		if (tok_op in [.pipe, .amp, .xor]) && !(is_integer_type(expr_type) &&
 			is_integer_type(typ)) {
-			p.error('operators `&` and `|` are defined only on integer types')
+			p.error('operator ${tok_op.str()} is defined only on integer types')
 		}	
 		p.check_types(expr_type, typ)
 		if (is_str || is_ustr) && tok_op == .plus && !p.is_js {