diff --git a/tvix/Cargo.nix b/tvix/Cargo.nix
index 640880d49..12d111bed 100644
--- a/tvix/Cargo.nix
+++ b/tvix/Cargo.nix
@@ -16508,6 +16508,7 @@ rec {
           "tonic-reflection" = [ "dep:tonic-reflection" "tvix-castore/tonic-reflection" ];
           "tracy" = [ "tvix-tracing/tracy" ];
           "virtiofs" = [ "tvix-castore/virtiofs" ];
+          "xp-store-composition" = [ "toml" ];
         };
         resolvedDefaultFeatures = [ "cloud" "default" "fuse" "integration" "otlp" "toml" "tonic-reflection" "tracy" "virtiofs" "xp-store-composition" ];
       };
diff --git a/tvix/store/Cargo.toml b/tvix/store/Cargo.toml
index e9c8b1fc5..e70ed0e39 100644
--- a/tvix/store/Cargo.toml
+++ b/tvix/store/Cargo.toml
@@ -75,7 +75,7 @@ otlp = ["tvix-tracing/otlp"]
 tonic-reflection = ["dep:tonic-reflection", "tvix-castore/tonic-reflection"]
 tracy = ["tvix-tracing/tracy"]
 virtiofs = ["tvix-castore/virtiofs"]
-xp-store-composition = []
+xp-store-composition = ["toml"]
 # Whether to run the integration tests.
 # Requires the following packages in $PATH:
 # cbtemulator, google-cloud-bigtable-tool