diff --git a/libs/binder/RpcState.cpp b/libs/binder/RpcState.cpp
index 26a2f4f..749c2f8 100644
--- a/libs/binder/RpcState.cpp
+++ b/libs/binder/RpcState.cpp
@@ -412,10 +412,8 @@
             return false;
         }
 #else
-        // TODO(b/305983144)
-        // don't restrict on other platforms, though experimental should
-        // only really be used for testing, we don't have a good way to see
-        // what is shipping outside of Android
+        ALOGE("Cannot use experimental RPC binder protocol outside of Android.");
+        return false;
 #endif
     } else if (version >= RPC_WIRE_PROTOCOL_VERSION_NEXT) {
         ALOGE("Cannot use RPC binder protocol version %u which is unknown (current protocol "
diff --git a/libs/binder/tests/binderRpcTestCommon.h b/libs/binder/tests/binderRpcTestCommon.h
index 786fab8..c3070dd 100644
--- a/libs/binder/tests/binderRpcTestCommon.h
+++ b/libs/binder/tests/binderRpcTestCommon.h
@@ -74,8 +74,7 @@
 #ifdef __ANDROID__
     return base::GetProperty("ro.build.version.codename", "") != "REL";
 #else
-    // TODO(b/305983144): restrict on other platforms
-    return true;
+    return false;
 #endif
 }