diff --git a/dist/main/index.js b/dist/main/index.js
index 38c02a1..fc064b0 100644
--- a/dist/main/index.js
+++ b/dist/main/index.js
@@ -7842,9 +7842,9 @@ async function setup() {
         }
     }
     core.saveState('pushMode', pushMode);
+    const tmpdir = process.env['RUNNER_TEMP'] ?? os.tmpdir();
     switch (pushMode) {
         case PushMode.Daemon: {
-            const tmpdir = process.env['RUNNER_TEMP'] ?? os.tmpdir();
             const daemonDir = await fs.mkdtemp(path.join(tmpdir, 'cachix-daemon-'));
             const daemonLog = (0, node_fs_1.openSync)(`${daemonDir}/daemon.log`, 'a');
             const daemon = (0, node_child_process_1.spawn)(cachixBin, [
@@ -7877,7 +7877,9 @@ async function setup() {
         }
         case PushMode.StoreScan: {
             // Remember existing store paths
-            await exec.exec("sh", ["-c", `${__dirname}/list-nix-store.sh > /tmp/store-path-pre-build`]);
+            const preBuildPathsFile = `${tmpdir}/store-path-pre-build`;
+            core.saveState('preBuildPathsFile', preBuildPathsFile);
+            await exec.exec("sh", ["-c", `${__dirname}/list-nix-store.sh > ${preBuildPathsFile}`]);
             break;
         }
         default:
@@ -7930,7 +7932,8 @@ async function upload() {
             break;
         }
         case PushMode.StoreScan: {
-            await exec.exec(`${__dirname}/push-paths.sh`, [cachixBin, cachixArgs, name, pushFilter]);
+            const preBuildPathsFile = core.getState('preBuildPathsFile');
+            await exec.exec(`${__dirname}/push-paths.sh`, [cachixBin, cachixArgs, name, preBuildPathsFile, pushFilter]);
             break;
         }
     }
diff --git a/dist/main/push-paths.sh b/dist/main/push-paths.sh
index 16c08a7..933b217 100755
--- a/dist/main/push-paths.sh
+++ b/dist/main/push-paths.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-cachix=$1 cachixArgs=${2:--j8} cache=$3 pushFilter=$4
+cachix=$1 cachixArgs=${2:--j8} cache=$3 preBuildPathsFile=$4 pushFilter=$5
 
 filterPaths() {
   local regex=$1
@@ -12,10 +12,21 @@ filterPaths() {
   done | xargs
 }
 
-pathsToPush=$(comm -13 <(sort /tmp/store-path-pre-build) <("$(dirname "$0")"/list-nix-store.sh))
+pathsToPush=""
+preBuildPaths=$(sort "$preBuildPathsFile")
+if [ $? -eq 0 ]; then
+  postBuildPaths=$("$(dirname "$0")"/list-nix-store.sh | sort)
+  if [ $? -eq 0 ]; then
+    pathsToPush=$(comm -13 <(echo "$preBuildPaths") <(echo "$postBuildPaths"))
+  else
+    echo "::error::Failed to list post-build store paths."
+  fi
+else
+  printf "::error::Failed to find pre-build store paths. Expected cached paths in %s\n" "$preBuildPathsFile"
+fi
 
 if [[ -n $pushFilter ]]; then
-    pathsToPush=$(filterPaths $pushFilter "$pathsToPush")
+  pathsToPush=$(filterPaths $pushFilter "$pathsToPush")
 fi
 
 echo "$pathsToPush" | "$cachix" push $cachixArgs "$cache"
diff --git a/src/main.ts b/src/main.ts
index 3abd0de..7ab2b82 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -130,9 +130,10 @@ async function setup() {
 
   core.saveState('pushMode', pushMode);
 
+  const tmpdir = process.env['RUNNER_TEMP'] ?? os.tmpdir();
+
   switch (pushMode) {
     case PushMode.Daemon: {
-      const tmpdir = process.env['RUNNER_TEMP'] ?? os.tmpdir();
       const daemonDir = await fs.mkdtemp(path.join(tmpdir, 'cachix-daemon-'));
       const daemonLog = openSync(`${daemonDir}/daemon.log`, 'a');
 
@@ -176,7 +177,9 @@ async function setup() {
 
     case PushMode.StoreScan: {
       // Remember existing store paths
-      await exec.exec("sh", ["-c", `${__dirname}/list-nix-store.sh > /tmp/store-path-pre-build`]);
+      const preBuildPathsFile = `${tmpdir}/store-path-pre-build`;
+      core.saveState('preBuildPathsFile', preBuildPathsFile);
+      await exec.exec("sh", ["-c", `${__dirname}/list-nix-store.sh > ${preBuildPathsFile}`]);
       break;
     }
 
@@ -244,7 +247,8 @@ async function upload() {
     }
 
     case PushMode.StoreScan: {
-      await exec.exec(`${__dirname}/push-paths.sh`, [cachixBin, cachixArgs, name, pushFilter]);
+      const preBuildPathsFile = core.getState('preBuildPathsFile');
+      await exec.exec(`${__dirname}/push-paths.sh`, [cachixBin, cachixArgs, name, preBuildPathsFile, pushFilter]);
       break;
     }
   }