diff --git a/Tethering/bpf_progs/Android.bp b/Tethering/bpf_progs/Android.bp
index d54f861..d62e9a1 100644
--- a/Tethering/bpf_progs/Android.bp
+++ b/Tethering/bpf_progs/Android.bp
@@ -31,3 +31,18 @@
         "system/netd/libnetdutils/include",  // for UidConstants.h
     ],
 }
+
+bpf {
+    name: "test.o",
+    srcs: ["test.c"],
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+    include_dirs: [
+        // TODO: get rid of system/netd.
+        "system/netd/bpf_progs",             // for bpf_net_helpers.h
+        "system/netd/libnetdbpf/include",    // for bpf_shared.h
+        "system/netd/libnetdutils/include",  // for UidConstants.h
+    ],
+}
diff --git a/Tethering/bpf_progs/offload.c b/Tethering/bpf_progs/offload.c
index d8dc60d..cc5af31 100644
--- a/Tethering/bpf_progs/offload.c
+++ b/Tethering/bpf_progs/offload.c
@@ -34,10 +34,6 @@
 // (tethering allowed when stats[iif].rxBytes + stats[iif].txBytes < limit[iif])
 DEFINE_BPF_MAP_GRW(tether_limit_map, HASH, uint32_t, uint64_t, 16, AID_NETWORK_STACK)
 
-// Used only by TetheringPrivilegedTests, not by production code.
-DEFINE_BPF_MAP_GRW(tether_ingress_map_TEST, HASH, TetherIngressKey, TetherIngressValue, 16,
-                   AID_NETWORK_STACK)
-
 static inline __always_inline int do_forward(struct __sk_buff* skb, bool is_ethernet) {
     int l2_header_size = is_ethernet ? sizeof(struct ethhdr) : 0;
     void* data = (void*)(long)skb->data;
diff --git a/Tethering/bpf_progs/test.c b/Tethering/bpf_progs/test.c
new file mode 100644
index 0000000..b5be33f
--- /dev/null
+++ b/Tethering/bpf_progs/test.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "bpf_helpers.h"
+#include "bpf_net_helpers.h"
+#include "netdbpf/bpf_shared.h"
+
+// Used only by TetheringPrivilegedTests, not by production code.
+DEFINE_BPF_MAP_GRW(tether_ingress_map, HASH, TetherIngressKey, TetherIngressValue, 16,
+                   AID_NETWORK_STACK)
+
+LICENSE("Apache 2.0");