diff --git a/backend/scripts/p2-acceptance.mjs b/backend/scripts/p2-acceptance.mjs
index aaa640ef..0be7e594 100644
--- a/backend/scripts/p2-acceptance.mjs
+++ b/backend/scripts/p2-acceptance.mjs
@@ -815,9 +815,12 @@ async function writeInstallationFiles(ctx) {
 }
 
 function thothctlBinaryPath(repositoryRoot) {
+  const platform = { darwin: "darwin", linux: "linux", win32: "windows" }[process.platform] ?? "linux";
+  const arch = { x64: "amd64", arm64: "arm64" }[process.arch] ?? "amd64";
+  const suffix = platform === "windows" ? ".exe" : "";
   const candidates = [
-    join(repositoryRoot, "tools", "thothctl", "bin", "thothctl"),
-    join(repositoryRoot, "dist", "thothctl", "bin", "thothctl"),
+    join(repositoryRoot, "dist", "thothctl", `thothctl-${platform}-${arch}${suffix}`),
+    join(repositoryRoot, "tools", "thothctl", "bin", `thothctl${suffix}`),
   ];
   for (const candidate of candidates) if (existsSync(candidate)) return candidate;
   throw new Error("built thothctl binary is unavailable");