diff --git a/src/ameba/cli/cmd.cr b/src/ameba/cli/cmd.cr
index 71051724..6cebd608 100644
--- a/src/ameba/cli/cmd.cr
+++ b/src/ameba/cli/cmd.cr
@@ -184,10 +184,11 @@ module Ameba::Cli
 
   private def print_rules(config)
     config.rules.each do |rule|
-      puts \
-        "#{rule.name.colorize(:white)} " \
-        "[#{rule.severity.symbol.to_s.colorize(:green)}] - " \
-        "#{rule.description.colorize(:dark_gray)}"
+      puts "%s [%s] - %s" % {
+        rule.name.colorize(:white),
+        rule.severity.symbol.to_s.colorize(:green),
+        rule.description.colorize(:dark_gray),
+      }
     end
     exit 0
   end
diff --git a/src/ameba/formatter/dot_formatter.cr b/src/ameba/formatter/dot_formatter.cr
index 788d9135..38575e18 100644
--- a/src/ameba/formatter/dot_formatter.cr
+++ b/src/ameba/formatter/dot_formatter.cr
@@ -45,10 +45,11 @@ module Ameba::Formatter
             end
           end
           output.puts
-          output.puts \
-            "[#{issue.rule.severity.symbol}] " \
-            "#{issue.rule.name}: " \
-            "#{issue.message}".colorize(:red)
+          output.puts ("[%s] %s: %s" % {
+            issue.rule.severity.symbol,
+            issue.rule.name,
+            issue.message,
+          }).colorize(:red)
 
           if show_affected_code && (code = affected_code(issue))
             output << code.colorize(:default)