diff --git a/misc/cgo/testcshared/testdata/libgo2/dup2.go b/misc/cgo/testcshared/testdata/libgo2/dup2.go
index ef86083a03..d50e0c42ab 100644
--- a/misc/cgo/testcshared/testdata/libgo2/dup2.go
+++ b/misc/cgo/testcshared/testdata/libgo2/dup2.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || dragonfly || freebsd || (linux && !arm64 && !riscv64) || netbsd || openbsd
+//go:build darwin || dragonfly || freebsd || (linux && !arm64 && !loong64 && !riscv64) || netbsd || openbsd
 
 package main
 
diff --git a/misc/cgo/testcshared/testdata/libgo2/dup3.go b/misc/cgo/testcshared/testdata/libgo2/dup3.go
index 913c4bbaca..ec4b5a73ec 100644
--- a/misc/cgo/testcshared/testdata/libgo2/dup3.go
+++ b/misc/cgo/testcshared/testdata/libgo2/dup3.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (linux && arm64) || (linux && riscv64)
+//go:build (linux && arm64) || (linux && loong64) || (linux && riscv64)
 
 package main
 
diff --git a/src/cmd/dist/test.go b/src/cmd/dist/test.go
index b7c200af36..f58b49e028 100644
--- a/src/cmd/dist/test.go
+++ b/src/cmd/dist/test.go
@@ -1716,7 +1716,7 @@ func buildModeSupported(compiler, buildmode, goos, goarch string) bool {
 
 	case "c-shared":
 		switch platform {
-		case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/ppc64le", "linux/riscv64", "linux/s390x",
+		case "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/386", "linux/ppc64le", "linux/riscv64", "linux/s390x",
 			"android/amd64", "android/arm", "android/arm64", "android/386",
 			"freebsd/amd64",
 			"darwin/amd64", "darwin/arm64",
diff --git a/src/internal/platform/supported.go b/src/internal/platform/supported.go
index 7039c76774..01524fbcd7 100644
--- a/src/internal/platform/supported.go
+++ b/src/internal/platform/supported.go
@@ -157,7 +157,7 @@ func BuildModeSupported(compiler, buildmode, goos, goarch string) bool {
 
 	case "c-shared":
 		switch platform {
-		case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/ppc64le", "linux/riscv64", "linux/s390x",
+		case "linux/amd64", "linux/arm", "linux/arm64", "linux/loong64", "linux/386", "linux/ppc64le", "linux/riscv64", "linux/s390x",
 			"android/amd64", "android/arm", "android/arm64", "android/386",
 			"freebsd/amd64",
 			"darwin/amd64", "darwin/arm64",