diff --git a/vlib/compiler/gen_c.v b/vlib/compiler/gen_c.v
index c4a40ff392..b68d9d98ec 100644
--- a/vlib/compiler/gen_c.v
+++ b/vlib/compiler/gen_c.v
@@ -516,9 +516,13 @@ fn (p mut Parser) cast(typ string) {
 		p.cgen.set_placeholder(pos, '*($typ*)(')
 	}
 	else {
-		if (is_number_type(expr_typ) || is_float_type(expr_typ))  && typ == 'bool' {
-			p.error('cannot cast a number to `bool`')
-		}	
+		// Nothing can be cast to bool
+		if typ == 'bool' {
+			if is_number_type(expr_typ) || is_float_type(expr_typ) {
+				p.error('cannot cast a number to `bool`')
+			}	
+			p.error('cannot cast `$expr_typ` to `bool`')
+		}
 		p.cgen.set_placeholder(pos, '($typ)(')
 	}
 	p.check(.rpar)