diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8072bd7eef..57465ed846 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ This is the log of notable changes to EAS CLI and related packages.
 
 ### 🐛 Bug fixes
 
+- Make directories marked as read-only in Windows writable when creating a tar, to prevent the cross-filesystem issues when extracting the tar. ([#3489](https://github.com/expo/eas-cli/pull/3489) by [@sswrk](https://github.com/sswrk))
+
 ### 🧹 Chores
 
 ## [18.3.0](https://github.com/expo/eas-cli/releases/tag/v18.3.0) - 2026-03-10
diff --git a/packages/eas-cli/src/build/utils/repository.ts b/packages/eas-cli/src/build/utils/repository.ts
index 853b5d72cc..90270590a9 100644
--- a/packages/eas-cli/src/build/utils/repository.ts
+++ b/packages/eas-cli/src/build/utils/repository.ts
@@ -143,9 +143,27 @@ export async function makeProjectTarballAsync(vcsClient: Client): Promise<LocalF
 
   try {
     await vcsClient.makeShallowCopyAsync(shallowClonePath);
-    await tar.create({ cwd: shallowClonePath, file: tarPath, prefix: 'project', gzip: true }, [
-      '.',
-    ]);
+    await tar.create(
+      {
+        cwd: shallowClonePath,
+        file: tarPath,
+        prefix: 'project',
+        gzip: true,
+        ...(process.platform === 'win32' && {
+          onWriteEntry(entry) {
+            // On Windows, read-only directories can have files created inside them.
+            // However, Node.js maps this to the `0o555` mode, which when moved to POSIX,
+            // prevents creating files inside them. This causes trouble on tar extraction.
+            // Hence, we're forcing the owner write bit on directories in Windows
+            // to avoid this issue.
+            if (entry.type === 'Directory' && entry.stat) {
+              entry.stat.mode |= 0o200;
+            }
+          },
+        }),
+      },
+      ['.']
+    );
   } catch (err) {
     clearTimeout(timer);
     if (spinner.isSpinning) {