diff --git a/internal/runtimex/readunaligned.go b/internal/runtimex/readunaligned.go
index 6e545073..f7e49dc4 100644
--- a/internal/runtimex/readunaligned.go
+++ b/internal/runtimex/readunaligned.go
@@ -12,11 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build 386 || amd64 || arm || arm64 || ppc64le || mips64le || mipsle || riscv64 || wasm
-// +build 386 amd64 arm arm64 ppc64le mips64le mipsle riscv64 wasm
+//go:build 386 || amd64 || arm || arm64 || ppc64le || mips64le || mipsle || riscv64 || wasm || loong64
+// +build 386 amd64 arm arm64 ppc64le mips64le mipsle riscv64 wasm loong64
 
 //
-// from golang-go/src/os/endian_big.go
+// from golang-go/src/os/endian_little.go
 
 package runtimex
 
diff --git a/internal/runtimex/readunaligned_bigendian.go b/internal/runtimex/readunaligned_bigendian.go
index 3b88d01a..12a90f2d 100644
--- a/internal/runtimex/readunaligned_bigendian.go
+++ b/internal/runtimex/readunaligned_bigendian.go
@@ -16,7 +16,7 @@
 // +build ppc64 s390x mips mips64
 
 //
-// from golang-go/src/os/endian_little.go
+// from golang-go/src/os/endian_big.go
 
 package runtimex