diff --git a/lib/lotus/repository.rb b/lib/lotus/repository.rb
index 507913b2..82bae064 100644
--- a/lib/lotus/repository.rb
+++ b/lib/lotus/repository.rb
@@ -551,6 +551,7 @@ def transaction(options = {})
         end
       end
 
+      private
       # Executes the given raw statement on the adapter.
       #
       # Please note that it's only supported by some databases,
@@ -595,7 +596,6 @@ def execute(raw)
         @adapter.execute(raw)
       end
 
-      private
       # Fabricates a query and yields the given block to access the low level
       # APIs exposed by the query itself.
       #
diff --git a/test/fixtures.rb b/test/fixtures.rb
index 7de3a1d4..eabe95dc 100644
--- a/test/fixtures.rb
+++ b/test/fixtures.rb
@@ -48,6 +48,10 @@ def self.not_by_user(user)
   def self.rank_by_user(user)
     rank.by_user(user)
   end
+
+  def self.aggregate
+    execute("select * from articles")
+  end
 end
 
 DB = Sequel.connect(SQLITE_CONNECTION_STRING)
diff --git a/test/repository_test.rb b/test/repository_test.rb
index 0ed45e30..9f0134ac 100644
--- a/test/repository_test.rb
+++ b/test/repository_test.rb
@@ -453,9 +453,11 @@ def updated_at
     end
 
     describe '.execute' do
+      it 'is a private api' do
+        -> { ArticleRepository.execute("select * from users") }.must_raise NoMethodError
+      end
       it 'returns the ResultSet from the executes sql' do
-        sql = "select * from articles"
-        result = ArticleRepository.execute(sql)
+        result = ArticleRepository.aggregate
         result.class.name.must_equal "SQLite3::ResultSet"
         result.count.must_equal 1
       end
@@ -484,8 +486,11 @@ def updated_at
     end
 
     describe '.execute' do
-      it "an exception is raised because of memory adapter doesn't support execute" do
-        -> { ArticleRepository.execute("select * from users") }.must_raise NotImplementedError
+      it 'is a private api' do
+        -> { ArticleRepository.execute("select * from users") }.must_raise NoMethodError
+      end
+      it "raises an exception because memory adapter doesn't support execute" do
+        -> { ArticleRepository.aggregate }.must_raise NotImplementedError
       end
     end