diff --git a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
index 9b7877c88fbff14a3c25333d9d95485dddd50596..745c36ded5a60a91e8bde6e6805689d4b55fba56 100644
--- a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
@@ -116,7 +116,7 @@ StringRef loongarch::getLoongArchABI(const Driver &D, const ArgList &Args,
     // shall remain valid or not, so we are going to continue recognizing it
     // for some time, until it is clear that everyone else has migrated away
     // from it.
-    [[fallthrough]];
+    LLVM_FALLTHROUGH;
   case llvm::Triple::GNU:
   default:
     return IsLA32 ? "ilp32d" : "lp64d";
diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index 5b4380e4738612fc6147dee98ca3e1d0dec24966..aa9a39c1376526fdeda22b8609b03484e451bc48 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -350,7 +350,7 @@ SubtargetFeatures ELFObjectFileBase::getLoongArchFeatures() const {
   case ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT:
     Features.AddFeature("d");
     // D implies F according to LoongArch ISA spec.
-    [[fallthrough]];
+    LLVM_FALLTHROUGH;
   case ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT:
     Features.AddFeature("f");
     break;