diff --git a/lib/nanoc/base/entities/identifier.rb b/lib/nanoc/base/entities/identifier.rb
index 54230e56a7..6e4f5e1ac2 100644
--- a/lib/nanoc/base/entities/identifier.rb
+++ b/lib/nanoc/base/entities/identifier.rb
@@ -106,37 +106,20 @@ def prefix(string)
     end
 
     # @return [String]
-    def with_ext(ext)
+    def without_ext
       unless full?
         raise UnsupportedLegacyOperationError
       end
 
-      # Strip extension, if any
       extname = File.extname(@string)
-      string =
-        if extname.size > 0
-          @string[0..-extname.size - 1]
-        else
-          @string
-        end
 
-      # Add extension
-      if ext.size > 0
-        if ext.start_with?('.')
-          string + ext
-        else
-          string + '.' + ext
-        end
+      if extname.size > 0
+        @string[0..-extname.size - 1]
       else
-        string
+        @string
       end
     end
 
-    # @return [String]
-    def without_ext
-      with_ext('')
-    end
-
     # @return [String] The extension, without a leading dot.
     def ext
       unless full?
diff --git a/spec/nanoc/base/entities/identifier_spec.rb b/spec/nanoc/base/entities/identifier_spec.rb
index 362ec0f282..f0db409106 100644
--- a/spec/nanoc/base/entities/identifier_spec.rb
+++ b/spec/nanoc/base/entities/identifier_spec.rb
@@ -242,75 +242,6 @@
     end
   end
 
-  describe '#with_ext' do
-    subject { identifier.with_ext(ext) }
-
-    context 'legacy type' do
-      let(:identifier) { described_class.new('/foo/', type: :legacy) }
-      let(:ext) { 'html' }
-
-      it 'raises an error' do
-        expect { subject }.to raise_error(Nanoc::Identifier::UnsupportedLegacyOperationError)
-      end
-    end
-
-    context 'identifier with no extension' do
-      let(:identifier) { described_class.new('/foo') }
-
-      context 'extension without dot given' do
-        let(:ext) { 'html' }
-
-        it 'adds an extension' do
-          expect(subject).to eql('/foo.html')
-        end
-      end
-
-      context 'extension with dot given' do
-        let(:ext) { '.html' }
-
-        it 'adds an extension' do
-          expect(subject).to eql('/foo.html')
-        end
-      end
-
-      context 'empty extension given' do
-        let(:ext) { '' }
-
-        it 'removes the extension' do
-          expect(subject).to eql('/foo')
-        end
-      end
-    end
-
-    context 'identifier with extension' do
-      let(:identifier) { described_class.new('/foo.md') }
-
-      context 'extension without dot given' do
-        let(:ext) { 'html' }
-
-        it 'adds an extension' do
-          expect(subject).to eql('/foo.html')
-        end
-      end
-
-      context 'extension with dot given' do
-        let(:ext) { '.html' }
-
-        it 'adds an extension' do
-          expect(subject).to eql('/foo.html')
-        end
-      end
-
-      context 'empty extension given' do
-        let(:ext) { '' }
-
-        it 'removes the extension' do
-          expect(subject).to eql('/foo')
-        end
-      end
-    end
-  end
-
   describe '#without_ext' do
     subject { identifier.without_ext }