diff --git a/gyp/pathops_unittest.gyp b/gyp/pathops_unittest.gyp
index 87e125b..51af1e9 100644
--- a/gyp/pathops_unittest.gyp
+++ b/gyp/pathops_unittest.gyp
@@ -24,6 +24,7 @@
       'sources': [
         '../tests/PathOpsAngleIdeas.cpp',
         '../tests/PathOpsDebug.cpp',
+        '../tests/PathOpsOpLoopThreadedTest.cpp',
         '../tests/PathOpsSkpClipTest.cpp',
         '../tests/Test.cpp',
         '../tests/skia_test.cpp',