diff --git a/scripts/postinstall.mjs b/scripts/postinstall.mjs
index 449947b2bc..d8379f6b43 100644
--- a/scripts/postinstall.mjs
+++ b/scripts/postinstall.mjs
@@ -1,18 +1,22 @@
 #!/usr/bin/env node
 
 /**
- * OmniRoute — Postinstall Native Module Rebuild
+ * OmniRoute — Postinstall Native Module Fix
  *
  * The npm package ships with a Next.js standalone build that includes
- * better-sqlite3 compiled for the build platform (Linux x64).
- * This script detects platform mismatches and rebuilds the native
- * module for the user's actual OS/architecture.
+ * better-sqlite3 compiled for the build platform (Linux x64) inside
+ * app/node_modules/. However, npm also installs better-sqlite3 as a
+ * top-level dependency (in the root node_modules/), correctly compiled
+ * for the user's platform.
+ *
+ * This script copies the correctly-built native binary from the root
+ * into the standalone app directory — no rebuild or build tools needed.
  *
  * Fixes: https://github.com/diegosouzapw/OmniRoute/issues/129
+ * Fixes: https://github.com/diegosouzapw/OmniRoute/issues/321
  */
 
-import { execSync } from "node:child_process";
-import { existsSync } from "node:fs";
+import { existsSync, copyFileSync, mkdirSync } from "node:fs";
 import { join, dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 
@@ -20,62 +24,88 @@ const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 const ROOT = join(__dirname, "..");
 
-// The standalone build bundles better-sqlite3 inside app/node_modules
-const appNodeModules = join(ROOT, "app", "node_modules", "better-sqlite3");
+const appBinary = join(
+  ROOT,
+  "app",
+  "node_modules",
+  "better-sqlite3",
+  "build",
+  "Release",
+  "better_sqlite3.node"
+);
+const rootBinary = join(
+  ROOT,
+  "node_modules",
+  "better-sqlite3",
+  "build",
+  "Release",
+  "better_sqlite3.node"
+);
 
-if (!existsSync(appNodeModules)) {
-  // No bundled better-sqlite3 — nothing to do (dev install, not npm global)
+if (!existsSync(join(ROOT, "app", "node_modules", "better-sqlite3"))) {
+  // No standalone app directory — nothing to do (dev install, not npm global)
   process.exit(0);
 }
 
-const buildInfoPath = join(appNodeModules, "build", "Release", "better_sqlite3.node");
-
-// The published binary is compiled for linux-x64.
-// On any other platform/arch, we must rebuild — dlopen alone is unreliable
-// because macOS may load an incompatible binary without throwing.
+// The published binary is compiled for linux-x64. On any other platform/arch,
+// always replace it — dlopen alone is unreliable because macOS can load an
+// incompatible binary without throwing (the exact bug fixed in #312).
 const BUILD_PLATFORM = "linux";
 const BUILD_ARCH = "x64";
-const needsRebuild = process.platform !== BUILD_PLATFORM || process.arch !== BUILD_ARCH;
+const platformMatch = process.platform === BUILD_PLATFORM && process.arch === BUILD_ARCH;
 
-if (!needsRebuild) {
+if (platformMatch) {
   try {
-    process.dlopen({ exports: {} }, buildInfoPath);
+    process.dlopen({ exports: {} }, appBinary);
     process.exit(0);
   } catch {
-    // Same platform but binary still incompatible (e.g. Node.js ABI mismatch) — rebuild
+    // Same platform but binary still incompatible (e.g. Node.js ABI mismatch)
   }
 }
 
-console.log(`\n  🔧 Rebuilding better-sqlite3 for ${process.platform}-${process.arch}...`);
+console.log(`\n  🔧 Fixing better-sqlite3 binary for ${process.platform}-${process.arch}...`);
+
+// Strategy 1: Copy the correctly-built binary from root node_modules
+if (existsSync(rootBinary)) {
+  try {
+    mkdirSync(dirname(appBinary), { recursive: true });
+    copyFileSync(rootBinary, appBinary);
+
+    // Verify the copied binary loads
+    process.dlopen({ exports: {} }, appBinary);
+    console.log("  ✅ Native module fixed successfully!\n");
+    process.exit(0);
+  } catch {
+    // Copy succeeded but binary still doesn't load — fall through
+  }
+}
+
+// Strategy 2: Fall back to npm rebuild (may work if build tools are available)
+console.log("  ⚠️  Root binary not available, attempting npm rebuild...");
 
 try {
+  const { execSync } = await import("node:child_process");
   execSync("npm rebuild better-sqlite3", {
     cwd: join(ROOT, "app"),
     stdio: "inherit",
     timeout: 120_000,
   });
-} catch (error) {
-  console.error("  ❌ Failed to rebuild better-sqlite3 automatically.");
-  console.error("     You can fix this manually by running:");
-  console.error(`     cd ${join(ROOT, "app")} && npm rebuild better-sqlite3`);
-  if (process.platform === "darwin") {
-    console.error("     If build tools are missing: xcode-select --install");
-  }
-  console.error("");
-  process.exit(1);
+
+  // Verify rebuild worked
+  process.dlopen({ exports: {} }, appBinary);
+  console.log("  ✅ Native module rebuilt successfully!\n");
+  process.exit(0);
+} catch {
+  // Rebuild failed or binary still incompatible
 }
 
-// Verify the rebuilt binary actually loads
-try {
-  process.dlopen({ exports: {} }, buildInfoPath);
-  console.log("  ✅ Native module rebuilt successfully!\n");
-} catch {
-  console.error("  ❌ Rebuild completed but binary is still incompatible.");
-  console.error("     Try manually:");
-  console.error(`     cd ${join(ROOT, "app")} && npm rebuild better-sqlite3`);
-  if (process.platform === "darwin") {
-    console.error("     If build tools are missing: xcode-select --install");
-  }
-  console.error("");
-  process.exit(1);
+// If nothing worked, warn but don't fail the install — let the package stay
+// installed so users can fix manually or use the pre-flight check in the CLI
+console.warn("  ⚠️  Could not fix better-sqlite3 native module automatically.");
+console.warn("     The server may not start correctly.");
+console.warn("     Try manually:");
+console.warn(`     cd ${join(ROOT, "app")} && npm rebuild better-sqlite3`);
+if (process.platform === "darwin") {
+  console.warn("     If build tools are missing: xcode-select --install");
 }
+console.warn("");