diff --git a/misc/cgo/testshared/shared_test.go b/misc/cgo/testshared/shared_test.go
index 024f084da5..756c4baa6b 100644
--- a/misc/cgo/testshared/shared_test.go
+++ b/misc/cgo/testshared/shared_test.go
@@ -108,6 +108,15 @@ func testMain(m *testing.M) (int, error) {
 		defer os.RemoveAll(workDir)
 	}
 
+	// -buildmode=shared fundamentally does not work in module mode.
+	// (It tries to share package dependencies across builds, but in module mode
+	// each module has its own distinct set of dependency versions.)
+	// We would like to eliminate it (see https://go.dev/issue/47788),
+	// but first need to figure out a replacement that covers the small subset
+	// of use-cases where -buildmode=shared still works today.
+	// For now, run the tests in GOPATH mode only.
+	os.Setenv("GO111MODULE", "off")
+
 	// Some tests need to edit the source in GOPATH, so copy this directory to a
 	// temporary directory and chdir to that.
 	gopath := filepath.Join(workDir, "gopath")