diff --git a/CHANGELOG.md b/CHANGELOG.md
index eac65e87..12ea0464 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 * TODO
 
+### 0.43.0
+
+* Extract correct test directory from test file pattern that has multiple patterns.
+
+    https://github.com/KnapsackPro/knapsack_pro-ruby/pull/43
+
+https://github.com/KnapsackPro/knapsack_pro-ruby/compare/v0.42.0...v0.43.0
+
 ### 0.42.0
 
 * Clear RSpec examples without shared examples in similar way as in RSpec 3.6.0
diff --git a/lib/knapsack_pro/base_allocator_builder.rb b/lib/knapsack_pro/base_allocator_builder.rb
index 8f40a583..1ca05323 100644
--- a/lib/knapsack_pro/base_allocator_builder.rb
+++ b/lib/knapsack_pro/base_allocator_builder.rb
@@ -9,7 +9,7 @@ def allocator
     end
 
     def test_dir
-      test_file_pattern.split('/').first
+      test_file_pattern.split('/').first.gsub(/({)/, '')
     end
 
     private
diff --git a/spec/knapsack_pro/base_allocator_builder_spec.rb b/spec/knapsack_pro/base_allocator_builder_spec.rb
index 6d385303..c4bbba8e 100644
--- a/spec/knapsack_pro/base_allocator_builder_spec.rb
+++ b/spec/knapsack_pro/base_allocator_builder_spec.rb
@@ -14,9 +14,19 @@
     subject { allocator_builder.test_dir }
 
     before do
-      expect(KnapsackPro::TestFilePattern).to receive(:call).with(adapter_class).and_return('spec/**{,/*/**}/*_spec.rb')
+      expect(KnapsackPro::TestFilePattern).to receive(:call).with(adapter_class).and_return(test_file_pattern)
     end
 
-    it { should eq 'spec' }
+    context 'when single pattern' do
+      let(:test_file_pattern) { 'spec/**{,/*/**}/*_spec.rb' }
+
+      it { should eq 'spec' }
+    end
+
+    context 'when multiple patterns' do
+      let(:test_file_pattern) { '{spec/controllers/**/*.rb,spec/decorators/**/*.rb}' }
+
+      it { should eq 'spec' }
+    end
   end
 end