diff --git a/spec/config_spec.cr b/spec/config_spec.cr
index 11229e648b..9d0864703f 100644
--- a/spec/config_spec.cr
+++ b/spec/config_spec.cr
@@ -440,12 +440,22 @@ describe LavinMQ::Config do
         default_password = +pHuxkR9fCyrrwXjOD4BP4XbzO3l8LJr8YkThMgJ0yVHFRE+
       CONFIG
       end
-      logs = Log.capture(level: :info) do
+      stderr_file = File.tempfile("stderr")
+      old_stderr = STDERR.dup
+      file = File.open(stderr_file.path, "w")
+      begin
+        STDERR.reopen(file)
         config = LavinMQ::Config.new
         argv = ["-c", config_file.path]
         config.parse(argv)
+      ensure
+        STDERR.reopen(old_stderr)
+        old_stderr.close
+        file.close
       end
-      logs.check(:warn, /is deprecated/)
+      File.read(stderr_file.path).should match(/is deprecated/)
+    ensure
+      stderr_file.try &.delete
     end
 
     it "should log warning for cli options" do
@@ -454,12 +464,22 @@ describe LavinMQ::Config do
         [main]
       CONFIG
       end
-      logs = Log.capture(level: :info) do
+      stderr_file = File.tempfile("stderr")
+      old_stderr = STDERR.dup
+      file = File.open(stderr_file.path, "w")
+      begin
+        STDERR.reopen(file)
         config = LavinMQ::Config.new
         argv = ["-c", config_file.path, "--default-password", "8Yw8kj5HkhfRxQ/3kbTAO/nmgqGpkvMsGDbUWXA6+jTF3JP3"]
         config.parse(argv)
+      ensure
+        STDERR.reopen(old_stderr)
+        old_stderr.close
+        file.close
       end
-      logs.check(:warn, /is deprecated/)
+      File.read(stderr_file.path).should match(/is deprecated/)
+    ensure
+      stderr_file.try &.delete
     end
 
     it "should forward ini option values to the new property" do
diff --git a/src/lavinmq/config.cr b/src/lavinmq/config.cr
index 472e264170..fb8f5e7710 100644
--- a/src/lavinmq/config.cr
+++ b/src/lavinmq/config.cr
@@ -200,15 +200,15 @@ module LavinMQ
         {% for var in ivars_in_section %}
          when "{{var[:ini_name]}}"
          {% if (deprecated = var[:deprecated]) %}
-           Log.warn { "Config {{var[:ini_name]}} is deprecated, use {{deprecated.id}} instead" }
+           STDERR.puts "WARNING: Config {{var[:ini_name]}} is deprecated, use {{deprecated.id}} instead"
          {% end %}
          self.{{var[:var_name]}} = parse_value(v, {{var[:transform]}})
         {% end %}
      else
-       Log.warn { "Unknown setting #{name} in section {{section.id}}" }
+       STDERR.puts "WARNING: Unknown setting '#{name}' in section [{{section.id}}]"
       end
     rescue ex
-      Log.error { "Failed to handle value for '#{name}' in [{{section.id}}]: #{ex.message}" }
+      STDERR.puts "ERROR: Failed to handle value for '#{name}' in [{{section.id}}]: #{ex.message}"
       abort
     end
   {% end %}
@@ -363,7 +363,7 @@ module LavinMQ
       private def do_setup_parser(parser, *args)
         parser.on(*args) do |val|
           if msg = @deprecation_warn_msg
-            Log.warn { msg }
+            STDERR.puts "WARNING: #{msg}"
           end
           @set_value.call(val)
         end