diff --git a/llvm/utils/gn/secondary/compiler-rt/lib/tsan/rtl/BUILD.gn b/llvm/utils/gn/secondary/compiler-rt/lib/tsan/rtl/BUILD.gn
index a4004bb4c897a..6ecf9e312df93 100644
--- a/llvm/utils/gn/secondary/compiler-rt/lib/tsan/rtl/BUILD.gn
+++ b/llvm/utils/gn/secondary/compiler-rt/lib/tsan/rtl/BUILD.gn
@@ -122,6 +122,8 @@ target(tsan_target_type, "rtl") {
     sources += [ "tsan_rtl_aarch64.S" ]
   } else if (target_cpu == "powerpc64") {
     sources += [ "tsan_rtl_ppc64.S" ]
+  } else if (target_cpu == "loongarch64") {
+    sources += [ "tsan_rtl_loongarch64.S" ]
   } else if (target_cpu == "mips64") {
     sources += [ "tsan_rtl_mips64.S" ]
   } else if (target_cpu == "s390x") {