diff --git a/spec/ameba/rule/lint/unused_literal_spec.cr b/spec/ameba/rule/lint/unused_literal_spec.cr
index 5fc58aa39..65c4a5594 100644
--- a/spec/ameba/rule/lint/unused_literal_spec.cr
+++ b/spec/ameba/rule/lint/unused_literal_spec.cr
@@ -72,6 +72,13 @@ module Ameba::Rule::Lint
         CRYSTAL
     end
 
+    it "passes if a literal value is the object of a cast" do
+      expect_no_issues subject, <<-CRYSTAL
+        1.as(Int64)
+        "2".as?(String)
+        CRYSTAL
+    end
+
     it "fails if literals are top-level" do
       expect_issue subject, <<-CRYSTAL
           1234
diff --git a/src/ameba/ast/visitors/implicit_return_visitor.cr b/src/ameba/ast/visitors/implicit_return_visitor.cr
index a3deb745e..f21b84caf 100644
--- a/src/ameba/ast/visitors/implicit_return_visitor.cr
+++ b/src/ameba/ast/visitors/implicit_return_visitor.cr
@@ -25,7 +25,7 @@ module Ameba::AST
           if exp.is_a?(Crystal::ControlExpression)
             incr_stack { exp.accept(self) }
             break
-          elsif idx == last_idx && old_stack > 0
+          elsif idx == last_idx && old_stack.positive?
             incr_stack { exp.accept(self) }
           else
             exp.accept(self)
@@ -162,7 +162,7 @@ module Ameba::AST
     def visit(node : Crystal::Cast | Crystal::NilableCast) : Bool
       @rule.test(@source, node, @stack.positive?)
 
-      node.obj.accept(self)
+      incr_stack { node.obj.accept(self) }
 
       false
     end