diff --git a/spec/ameba/ast/visitors/flow_expression_visitor_spec.cr b/spec/ameba/ast/visitors/flow_expression_visitor_spec.cr
index 5053ff671..3e69729b0 100644
--- a/spec/ameba/ast/visitors/flow_expression_visitor_spec.cr
+++ b/spec/ameba/ast/visitors/flow_expression_visitor_spec.cr
@@ -1,8 +1,6 @@
 require "../../../spec_helper"
 
 module Ameba::AST
-  source = Source.new ""
-
   describe FlowExpressionVisitor do
     it "creates an expression for return" do
       rule = FlowExpressionRule.new
diff --git a/spec/spec_helper.cr b/spec/spec_helper.cr
index 346218528..094e0192e 100644
--- a/spec/spec_helper.cr
+++ b/spec/spec_helper.cr
@@ -6,7 +6,7 @@ module Ameba
   # Dummy Rule which does nothing.
   class DummyRule < Rule::Base
     properties do
-      description : String = "Dummy rule that does nothing."
+      description "Dummy rule that does nothing."
       dummy true
     end
 
@@ -92,7 +92,7 @@ module Ameba
 
   class PerfRule < Rule::Performance::Base
     properties do
-      description : String = "Sample performance rule"
+      description "Sample performance rule"
     end
 
     def test(source)
diff --git a/src/ameba/rule/lint/typos.cr b/src/ameba/rule/lint/typos.cr
index 09077240f..8cbb85094 100644
--- a/src/ameba/rule/lint/typos.cr
+++ b/src/ameba/rule/lint/typos.cr
@@ -15,7 +15,7 @@ module Ameba::Rule::Lint
   class Typos < Base
     properties do
       description "Reports typos found in source files"
-      bin_path : String? = nil
+      bin_path : String? = nil # ameba:disable Lint/UselessAssign
       fail_on_error false
     end
 
diff --git a/src/ameba/rule/style/verbose_block.cr b/src/ameba/rule/style/verbose_block.cr
index aaa66d201..8f7e19349 100644
--- a/src/ameba/rule/style/verbose_block.cr
+++ b/src/ameba/rule/style/verbose_block.cr
@@ -39,8 +39,8 @@ module Ameba::Rule::Style
       exclude_operators true
       exclude_setters false
 
-      max_line_length : Int32? = nil # 100
-      max_length : Int32? = 50
+      max_line_length : Int32? = nil # ameba:disable Lint/UselessAssign
+      max_length : Int32? = 50       # ameba:disable Lint/UselessAssign
     end
 
     MSG          = "Use short block notation instead: `%s`"