diff --git a/tools/http2_interop/go.mod b/tools/http2_interop/go.mod
new file mode 100644
index 00000000000..149c38e7d3f
--- /dev/null
+++ b/tools/http2_interop/go.mod
@@ -0,0 +1,3 @@
+module github.com/grpc/grpc/tools/http2_interop
+
+go 1.16