1 files changed, 1 insertions, 0 deletions
diff --git a/BUILD.gn b/BUILD.gn
index abd189b8eb..903e901046 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -757,6 +757,7 @@ test("pdfium_unittests") {
     "core/src/fxcrt/fx_basic_memmgr_unittest.cpp",
     "core/src/fxcrt/fx_basic_wstring_unittest.cpp",
     "core/src/fxcrt/fx_bidi_unittest.cpp",
+    "core/src/fxcrt/fx_extension_unittest.cpp",
     "core/src/fxcrt/fx_system_unittest.cpp",
     "third_party/base/nonstd_unique_ptr_unittest.cpp",
   ]