diff --git a/dist/index.js b/dist/index.js
index 6f5591f..983bb2a 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -12194,6 +12194,7 @@ async function setUpAutoCache() {
     await fs$2.mkdir(`${process.env["HOME"]}/.config/nix`, { recursive: true });
     const nixConf = openSync(`${process.env["HOME"]}/.config/nix/nix.conf`, 'a');
     writeSync(nixConf, `${"\n"}extra-substituters = http://${coreExports.getInput('listen')}/?trusted=1&compression=zstd&parallel-compression=true${"\n"}`);
+    writeSync(nixConf, `fallback = true${"\n"}`);
     close(nixConf);
     coreExports.debug('Launched Magic Nix Cache');
     coreExports.exportVariable(ENV_CACHE_DAEMONDIR, daemonDir);
diff --git a/src/index.ts b/src/index.ts
index 14db8ad..f520378 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -127,6 +127,7 @@ async function setUpAutoCache() {
   await fs.mkdir(`${process.env["HOME"]}/.config/nix`, { recursive: true });
   const nixConf = openSync(`${process.env["HOME"]}/.config/nix/nix.conf`, 'a');
   writeSync(nixConf, `${"\n"}extra-substituters = http://${core.getInput('listen')}/?trusted=1&compression=zstd&parallel-compression=true${"\n"}`);
+  writeSync(nixConf, `fallback = true${"\n"}`);
   close(nixConf);
 
   core.debug('Launched Magic Nix Cache');