diff --git a/packages/opencode/script/build.ts b/packages/opencode/script/build.ts
index 5704f22b07..c21bd7c734 100755
--- a/packages/opencode/script/build.ts
+++ b/packages/opencode/script/build.ts
@@ -137,12 +137,12 @@ for (const item of targets) {
   const bunfsRoot = item.os === "win32" ? "B:/~BUN/root/" : "/$bunfs/root/"
   const workerRelativePath = path.relative(dir, parserWorker).replaceAll("\\", "/")
 
-  // Use fork bun runtime for Windows targets
-  // Set BUN_FORK_VERSION env var (e.g. "1.3.9-opencode") to use anomalyco/bun fork binaries
-  const forkVersion = process.env.BUN_FORK_VERSION
-  if (item.os === "win32" && forkVersion) {
+  // Use anomalyco/bun fork for Windows targets (includes Ctrl+C fix from PR #25876)
+  // https://github.com/anomalyco/bun/releases/tag/v1.3.9-opencode.1
+  const BUN_FORK_VERSION = "1.3.9-opencode.1"
+  if (item.os === "win32") {
     const variant = item.avx2 === false ? "bun-windows-x64-baseline" : "bun-windows-x64"
-    process.env.BUN_COMPILE_TARGET_TARBALL_URL = `https://github.com/anomalyco/bun/releases/download/v${forkVersion}/${variant}.tgz`
+    process.env.BUN_COMPILE_TARGET_TARBALL_URL = `https://github.com/anomalyco/bun/releases/download/v${BUN_FORK_VERSION}/${variant}.tgz`
   } else {
     delete process.env.BUN_COMPILE_TARGET_TARBALL_URL
   }