diff --git a/config.public.json b/config.public.json
index e5dea69..f074ff5 100644
--- a/config.public.json
+++ b/config.public.json
@@ -147,6 +147,7 @@
     "nix": {
         "system": "x86_64-linux",
         "remote": "daemon",
-        "build_timeout_seconds": 3600
+        "build_timeout_seconds": 3600,
+        "initial_heap_size": "4g"
     }
 }