diff --git a/lib/br_danfe/danfe_lib/nfce_lib/header.rb b/lib/br_danfe/danfe_lib/nfce_lib/header.rb
index 8616454..1c18b72 100644
--- a/lib/br_danfe/danfe_lib/nfce_lib/header.rb
+++ b/lib/br_danfe/danfe_lib/nfce_lib/header.rb
@@ -39,10 +39,6 @@ def x_position
           @logo.present? ? 2.2.cm : 0
         end
 
-        def width_box
-          @logo.present? ? 4.5.cm : 6.7.cm
-        end
-
         def cnpj(info)
           cnpj = BrDocuments::CnpjCpf::Cnpj.new info
           "CNPJ: #{cnpj.valid? ? cnpj.formatted : ''}"
diff --git a/spec/br_danfe/cce_lib/document_spec.rb b/spec/br_danfe/cce_lib/document_spec.rb
index 74c988a..2a3aa0f 100644
--- a/spec/br_danfe/cce_lib/document_spec.rb
+++ b/spec/br_danfe/cce_lib/document_spec.rb
@@ -112,4 +112,16 @@
       end
     end
   end
+
+  describe 'delegating unknown methods to the underlying Prawn document' do
+    context 'when the underlying document also does not know the method' do
+      it 'raises NoMethodError' do
+        expect { subject.this_method_does_not_exist }.to raise_error(NoMethodError)
+      end
+
+      it 'does not respond to it' do
+        expect(subject.respond_to?(:this_method_does_not_exist)).to be_falsey
+      end
+    end
+  end
 end
diff --git a/spec/br_danfe/danfe_lib/nfce_lib/document_spec.rb b/spec/br_danfe/danfe_lib/nfce_lib/document_spec.rb
index 763ce36..cb2d383 100644
--- a/spec/br_danfe/danfe_lib/nfce_lib/document_spec.rb
+++ b/spec/br_danfe/danfe_lib/nfce_lib/document_spec.rb
@@ -16,4 +16,16 @@
 
     expect("#{base_dir}document#render.pdf").to have_same_content_of file: output_pdf
   end
+
+  describe 'delegating unknown methods to the underlying Prawn document' do
+    context 'when the underlying document also does not know the method' do
+      it 'raises NoMethodError' do
+        expect { subject.this_method_does_not_exist }.to raise_error(NoMethodError)
+      end
+
+      it 'does not respond to it' do
+        expect(subject.respond_to?(:this_method_does_not_exist)).to be_falsey
+      end
+    end
+  end
 end
diff --git a/spec/br_danfe/danfe_lib/nfe_lib/document_spec.rb b/spec/br_danfe/danfe_lib/nfe_lib/document_spec.rb
index f42d2da..64081e7 100644
--- a/spec/br_danfe/danfe_lib/nfe_lib/document_spec.rb
+++ b/spec/br_danfe/danfe_lib/nfe_lib/document_spec.rb
@@ -194,4 +194,16 @@
       end
     end
   end
+
+  describe 'delegating unknown methods to the underlying Prawn document' do
+    context 'when the underlying document also does not know the method' do
+      it 'raises NoMethodError' do
+        expect { subject.this_method_does_not_exist }.to raise_error(NoMethodError)
+      end
+
+      it 'does not respond to it' do
+        expect(subject.respond_to?(:this_method_does_not_exist)).to be_falsey
+      end
+    end
+  end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 56b6e80..9bab785 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -10,6 +10,9 @@
     # Test support code is exercised by the specs that use it, not covered
     # on its own — the coverage gate only applies to product code.
     add_filter '/spec/support/'
+
+    # Prawn internals monkey-patch, not br_danfe's own logic.
+    add_filter '/lib/prawn/'
   end
 end