diff --git a/spec/fixtures/grpc/Makefile b/spec/fixtures/grpc/Makefile
new file mode 100644
index 00000000000..438c74339d9
--- /dev/null
+++ b/spec/fixtures/grpc/Makefile
@@ -0,0 +1,20 @@
+ALL= targetservice/targetservice.pb.go targetservice/targetservice_grpc.pb.go target
+
+all: $(ALL)
+
+.PHONY: go
+
+clean:
+	rm -rf $(ALL)
+
+go:
+	go mod tidy && go mod download all
+
+target: go targetservice/targetservice.pb.go targetservice/targetservice_grpc.pb.go target.go
+	go build -o $@
+
+targetservice/targetservice.pb.go: proto/targetservice.proto
+	protoc -I proto/ --go_out=. --go-grpc_out=. proto/targetservice.proto
+
+targetservice/targetservice_grpc.pb.go: proto/targetservice.proto
+	protoc -I proto/ --go_out=. --go-grpc_out=. proto/targetservice.proto
diff --git a/spec/internal/grpc.lua b/spec/internal/grpc.lua
index 8c49cbda6af..92bd991b9d7 100644
--- a/spec/internal/grpc.lua
+++ b/spec/internal/grpc.lua
@@ -47,18 +47,18 @@ local function start_grpc_target()
   assert(make(CONSTANTS.GRPC_TARGET_SRC_PATH, {
     {
       target = "targetservice/targetservice.pb.go",
-      src    = { "../targetservice.proto" },
-      cmd    = "protoc --go_out=. --go-grpc_out=. -I ../ ../targetservice.proto",
+      src    = { "proto/targetservice.proto" },
+      cmd    = "protoc --go_out=. --go-grpc_out=. -I proto/ proto/targetservice.proto",
     },
     {
       target = "targetservice/targetservice_grpc.pb.go",
-      src    = { "../targetservice.proto" },
-      cmd    = "protoc --go_out=. --go-grpc_out=. -I ../ ../targetservice.proto",
+      src    = { "proto/targetservice.proto" },
+      cmd    = "protoc --go_out=. --go-grpc_out=. -I proto/ proto/targetservice.proto",
     },
     {
       target = "target",
-      src    = { "grpc-target.go", "targetservice/targetservice.pb.go", "targetservice/targetservice_grpc.pb.go" },
-      cmd    = "go mod tidy && go mod download all && go build",
+      src    = { "target.go", "targetservice/targetservice.pb.go", "targetservice/targetservice_grpc.pb.go" },
+      cmd    = "go mod tidy && go mod download all && go build -o target",
     },
   }))
   grpc_target_proc = assert(ngx_pipe.spawn({ CONSTANTS.GRPC_TARGET_SRC_PATH .. "/target" }, {