diff --git a/History.md b/History.md
index 33e64ae4..c42fcc85 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,7 @@
+## 1.2.6 (UNRELEASED)
+
+- Add missing block-only signature for debug logging
+
 ## 1.2.5
 
 - Fix use of jruby-rack under Java 8 (#324)
diff --git a/src/main/java/org/jruby/rack/ext/Logger.java b/src/main/java/org/jruby/rack/ext/Logger.java
index 5f723187..36d5659e 100644
--- a/src/main/java/org/jruby/rack/ext/Logger.java
+++ b/src/main/java/org/jruby/rack/ext/Logger.java
@@ -246,6 +246,11 @@ public IRubyObject debug(final ThreadContext context,
         return context.runtime.newBoolean( add(DEBUG, context, msg, block) );
     }
 
+    @JRubyMethod(name = "debug")
+    public IRubyObject debug(final ThreadContext context, final Block block) {
+        return debug(context, context.nil, block);
+    }
+
     //
     // :call-seq:
     // info(message)
diff --git a/src/spec/ruby/jruby/rack/logger_spec.rb b/src/spec/ruby/jruby/rack/logger_spec.rb
index 0b9bf298..b98b64f2 100644
--- a/src/spec/ruby/jruby/rack/logger_spec.rb
+++ b/src/spec/ruby/jruby/rack/logger_spec.rb
@@ -86,6 +86,26 @@
     expect(logger.warn?).to be true
   end
 
+  [:debug, :info, :warn, :error, :fatal].each do |level|
+    it "logs at #{level} level" do
+      logger.public_send(level, 'message')
+      expect(real_logger.logged_content).to eql "#{level.to_s.upcase}: message\n"
+
+      real_logger.reset
+      logger.public_send(level, 'message') { 'ignored' }
+      expect(real_logger.logged_content).to eql "#{level.to_s.upcase}: message\n"
+
+      real_logger.reset
+      logger.public_send(level, nil) { 'message' }
+      expect(real_logger.logged_content).to eql "#{level.to_s.upcase}: message\n"
+
+
+      real_logger.reset
+      logger.public_send(level) { 'message' }
+      expect(real_logger.logged_content).to eql "#{level.to_s.upcase}: message\n"
+    end
+  end
+
   it "disables real logger's formatting when formatter is set" do
     real_logger.formatting = true
     expect(real_logger.formatting?).to be true