diff --git a/lib/diver_down/web/module_store.rb b/lib/diver_down/web/module_store.rb
index 3665725..8b98f7e 100644
--- a/lib/diver_down/web/module_store.rb
+++ b/lib/diver_down/web/module_store.rb
@@ -31,7 +31,13 @@ def get(source_name)
 
       # @return [Hash]
       def to_h
-        @store.dup
+        sorted_store = {}
+
+        @store.keys.sort.each do |key|
+          sorted_store[key] = @store[key]
+        end
+
+        sorted_store
       end
 
       # Write store to file
diff --git a/spec/diver_down/web/module_store_spec.rb b/spec/diver_down/web/module_store_spec.rb
index ad2ca75..8eccd41 100644
--- a/spec/diver_down/web/module_store_spec.rb
+++ b/spec/diver_down/web/module_store_spec.rb
@@ -46,6 +46,38 @@
           described_class.new(tempfile.path).get('a.rb')
         }.from([]).to(['A', 'B'])
       end
+
+      it 'sorts by source name' do
+        tempfile = Tempfile.new(['test', '.yaml'])
+        instance = described_class.new(tempfile.path)
+
+        sources = ['a.rb', 'b.rb', 'c.rb']
+
+        sources.shuffle.each do |source|
+          instance.set(source, ['A'])
+        end
+
+        expect {
+          instance.flush
+        }.to change {
+          described_class.new(tempfile.path).instance_variable_get(:@store).keys
+        }.from([]).to(sources)
+      end
+    end
+
+    describe '#to_h' do
+      it 'returns sorted hash' do
+        tempfile = Tempfile.new(['test', '.yaml'])
+        instance = described_class.new(tempfile.path)
+
+        sources = ['a.rb', 'b.rb', 'c.rb']
+
+        sources.shuffle.each do |source|
+          instance.set(source, ['A'])
+        end
+
+        expect(instance.to_h.keys).to eq(sources)
+      end
     end
   end
 end