diff --git a/dist/index.js b/dist/index.js
index cb568b3..7efc7df 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -171,9 +171,7 @@ function createOrUpdateBranch(git, commitMessage, base, branch, branchRemoteName
             if (branchRemoteName == 'fork') {
                 // If pushing to a fork we must fetch with 'unshallow' to avoid the following error on git push
                 // ! [remote rejected] HEAD -> tests/push-branch-to-fork (shallow update not allowed)
-                yield git.fetch([`${workingBase}:${workingBase}`], baseRemote, [
-                    '--force'
-                ]);
+                yield git.fetch([`${workingBase}:${workingBase}`], baseRemote, ['--force'], true);
             }
             else {
                 // If the remote is 'origin' we can git reset
@@ -801,14 +799,15 @@ class GitCommandManager {
             return output.exitCode === 0;
         });
     }
-    fetch(refSpec, remoteName, options) {
+    fetch(refSpec, remoteName, options, unshallow = false) {
         return __awaiter(this, void 0, void 0, function* () {
             const args = ['-c', 'protocol.version=2', 'fetch'];
             if (!refSpec.some(x => x === tagsRefSpec)) {
                 args.push('--no-tags');
             }
             args.push('--progress', '--no-recurse-submodules');
-            if (utils.fileExistsSync(path.join(this.workingDirectory, '.git', 'shallow'))) {
+            if (unshallow &&
+                utils.fileExistsSync(path.join(this.workingDirectory, '.git', 'shallow'))) {
                 args.push('--unshallow');
             }
             if (options) {
diff --git a/src/create-or-update-branch.ts b/src/create-or-update-branch.ts
index cb1fcbb..1c55ea5 100644
--- a/src/create-or-update-branch.ts
+++ b/src/create-or-update-branch.ts
@@ -180,9 +180,12 @@ export async function createOrUpdateBranch(
     if (branchRemoteName == 'fork') {
       // If pushing to a fork we must fetch with 'unshallow' to avoid the following error on git push
       // ! [remote rejected] HEAD -> tests/push-branch-to-fork (shallow update not allowed)
-      await git.fetch([`${workingBase}:${workingBase}`], baseRemote, [
-        '--force'
-      ])
+      await git.fetch(
+        [`${workingBase}:${workingBase}`],
+        baseRemote,
+        ['--force'],
+        true
+      )
     } else {
       // If the remote is 'origin' we can git reset
       await git.checkout(workingBase)
diff --git a/src/git-command-manager.ts b/src/git-command-manager.ts
index b77f078..d5671a8 100644
--- a/src/git-command-manager.ts
+++ b/src/git-command-manager.ts
@@ -105,7 +105,8 @@ export class GitCommandManager {
   async fetch(
     refSpec: string[],
     remoteName?: string,
-    options?: string[]
+    options?: string[],
+    unshallow = false
   ): Promise<void> {
     const args = ['-c', 'protocol.version=2', 'fetch']
     if (!refSpec.some(x => x === tagsRefSpec)) {
@@ -113,7 +114,9 @@ export class GitCommandManager {
     }
 
     args.push('--progress', '--no-recurse-submodules')
+
     if (
+      unshallow &&
       utils.fileExistsSync(path.join(this.workingDirectory, '.git', 'shallow'))
     ) {
       args.push('--unshallow')