diff --git a/utils/gn/build/sync_source_lists_from_cmake.py b/utils/gn/build/sync_source_lists_from_cmake.py
index 03cba7a..21abe7e 100755
--- a/utils/gn/build/sync_source_lists_from_cmake.py
+++ b/utils/gn/build/sync_source_lists_from_cmake.py
@@ -60,8 +60,7 @@
     # Matches e.g. |add_llvm_unittest_with_input_files|.
     unittest_re = re.compile(r'^add_\S+_unittest', re.MULTILINE)
 
-    # FIXME: Add 'llvm' here once it's complete.
-    checked = [ 'clang', 'lld' ]
+    checked = [ 'clang', 'lld', 'llvm' ]
     for c in checked:
         for root, _, _ in os.walk(os.path.join(c, 'unittests')):
             cmake_file = os.path.join(root, 'CMakeLists.txt')