diff --git a/vlib/v/checker/infix.v b/vlib/v/checker/infix.v
index 2b29c15330..6a7088c3de 100644
--- a/vlib/v/checker/infix.v
+++ b/vlib/v/checker/infix.v
@@ -24,6 +24,7 @@ fn (mut c Checker) infix_expr(mut node ast.InfixExpr) ast.Type {
 					to_type := c.expr(left_node.right.right)
 					c.autocast_in_if_conds(mut node.right, left_node.right.left, from_type,
 						to_type)
+					break
 				}
 			}
 			if left_node.op == .key_is {
@@ -830,18 +831,8 @@ fn (mut c Checker) invalid_operator_error(op token.Kind, left_type ast.Type, rig
 }
 
 // `if node is ast.Ident && node.is_mut { ... }` -> `if node is ast.Ident && (node as ast.Ident).is_mut { ... }`
-fn (mut c Checker) autocast_in_if_conds(mut right_ ast.Expr, from_expr ast.Expr, from_type ast.Type, to_type ast.Type) {
-	mut right := right_
+fn (mut c Checker) autocast_in_if_conds(mut right ast.Expr, from_expr ast.Expr, from_type ast.Type, to_type ast.Type) {
 	match mut right {
-		ast.Ident {
-			if right.name == from_expr.str() {
-				right_ = ast.AsCast{
-					typ: to_type
-					expr: from_expr
-					expr_type: from_type
-				}
-			}
-		}
 		ast.SelectorExpr {
 			if right.expr.str() == from_expr.str() {
 				right.expr = ast.ParExpr{
@@ -872,6 +863,7 @@ fn (mut c Checker) autocast_in_if_conds(mut right_ ast.Expr, from_expr ast.Expr,
 					}
 				}
 			}
+			c.autocast_in_if_conds(mut right.left, from_expr, from_type, to_type)
 			for mut arg in right.args {
 				c.autocast_in_if_conds(mut arg.expr, from_expr, from_type, to_type)
 			}
diff --git a/vlib/v/tests/autocast_in_if_conds_4_test.v b/vlib/v/tests/autocast_in_if_conds_4_test.v
deleted file mode 100644
index 6b83306f0e..0000000000
--- a/vlib/v/tests/autocast_in_if_conds_4_test.v
+++ /dev/null
@@ -1,32 +0,0 @@
-type MySumType = S1 | S2
-
-struct Info {
-	name string
-}
-
-struct S1 {
-	is_info bool
-	info    Info
-}
-
-struct S2 {
-	field2 string
-}
-
-fn get_name(s1 S1) string {
-	return s1.info.name
-}
-
-fn test_autocast_in_if_conds() {
-	s := MySumType(S1{
-		is_info: false
-		info: Info{'foo'}
-	})
-
-	if s is S1 && !s.is_info && get_name(s) == 'foo' {
-		println('ok')
-		assert true
-	} else {
-		assert false
-	}
-}