diff --git a/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/bugprone/BUILD.gn b/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/bugprone/BUILD.gn
index a4de4f0ce9252d..af0b03246b5669 100644
--- a/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/bugprone/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/bugprone/BUILD.gn
@@ -86,6 +86,7 @@ static_library("bugprone") {
     "SuspiciousStringviewDataUsageCheck.cpp",
     "SwappedArgumentsCheck.cpp",
     "SwitchMissingDefaultCaseCheck.cpp",
+    "TaggedUnionMemberCountCheck.cpp",
     "TerminatingContinueCheck.cpp",
     "ThrowKeywordMissingCheck.cpp",
     "TooSmallLoopVariableCheck.cpp",