diff --git a/lix/nix/upgrade-nix.cc b/lix/nix/upgrade-nix.cc
index 6617b4818..cc3384f4a 100644
--- a/lix/nix/upgrade-nix.cc
+++ b/lix/nix/upgrade-nix.cc
@@ -141,6 +141,8 @@ struct CmdUpgradeNix : MixDryRun, EvalCommand
             // install the new one, in case the new and old versions aren't considered
             // to be "the same package" by nix-env's logic (e.g., if their pnames differ).
             Strings removeArgs = {
+                "--store",
+                "local",
                 "--uninstall",
                 oldNixEnv,
                 "--profile",
@@ -150,6 +152,8 @@ struct CmdUpgradeNix : MixDryRun, EvalCommand
             aio().blockOn(runProgram(newNixEnv, false, removeArgs));
 
             Strings upgradeArgs = {
+                "--store",
+                "local",
                 "--profile",
                 this->profileDir,
                 "--install",
diff --git a/misc/upgrade-lix.sh b/misc/upgrade-lix.sh
index 664e919ae..34689eed3 100755
--- a/misc/upgrade-lix.sh
+++ b/misc/upgrade-lix.sh
@@ -124,9 +124,12 @@ checkSystemdService
 
 set -x
 exec "$NIX" run \
+    --store local \
     --extra-experimental-features "nix-command flakes" \
     "${SUBSTITUTER_ARGS[@]}" \
     "${LIX_BASE}?ref=${LIX_REF}" \
+    -- \
+    --store local \
     --extra-experimental-features "nix-command flakes" \
     upgrade-nix \
     "${SUBSTITUTER_ARGS[@]}"