diff --git a/spec/ameba/formatter/todo_formatter_spec.cr b/spec/ameba/formatter/todo_formatter_spec.cr
index 3f7a8214..ec9fdf99 100644
--- a/spec/ameba/formatter/todo_formatter_spec.cr
+++ b/spec/ameba/formatter/todo_formatter_spec.cr
@@ -2,7 +2,7 @@ require "../../spec_helper"
 require "file_utils"
 
 module Ameba
-  private def with_formatter
+  private def with_formatter(&)
     io = IO::Memory.new
     formatter = Formatter::TODOFormatter.new(io)
 
diff --git a/src/ameba/runner.cr b/src/ameba/runner.cr
index c2c5ac51..fb2be08a 100644
--- a/src/ameba/runner.cr
+++ b/src/ameba/runner.cr
@@ -179,7 +179,7 @@ module Ameba
 
     private MAX_ITERATIONS = 200
 
-    private def loop_unless_infinite(source, corrected_issues)
+    private def loop_unless_infinite(source, corrected_issues, &)
       # Keep track of the state of the source. If a rule modifies the source
       # and another rule undoes it producing identical source we have an
       # infinite loop.
diff --git a/src/ameba/source/rewriter/action.cr b/src/ameba/source/rewriter/action.cr
index 5fa1cc96..a13013c2 100644
--- a/src/ameba/source/rewriter/action.cr
+++ b/src/ameba/source/rewriter/action.cr
@@ -111,7 +111,7 @@ class Ameba::Source::Rewriter
     end
 
     # Similar to `@children.bsearch_index || size` except allows for a starting point
-    protected def bsearch_child_index(from = 0)
+    protected def bsearch_child_index(from = 0, &)
       size = @children.size
       (from...size).bsearch { |i| yield @children[i] } || size
     end