diff --git a/__tests__/buildx/build.test.ts b/__tests__/buildx/build.test.ts
index 3d44fa72..e56fa28e 100644
--- a/__tests__/buildx/build.test.ts
+++ b/__tests__/buildx/build.test.ts
@@ -93,6 +93,7 @@ describe('gitContext', () => {
     [{ref: 'refs/tags/v1.0.0', format: 'query', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true}, 'https://github.com/docker/actions-toolkit.git?ref=refs/tags/v1.0.0&checksum=860c1904a1ce19322e91ac35af1ab07466440c37'],
     [{ref: 'refs/pull/15/merge', format: 'query', prHeadRef: true, sendGitQueryAsInput: false, buildxQuerySupport: true}, 'https://github.com/docker/actions-toolkit.git?ref=refs/pull/15/head&checksum=860c1904a1ce19322e91ac35af1ab07466440c37'],
     [{ref: 'refs/heads/master', format: 'query', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, subdir: 'subdir'}, 'https://github.com/docker/actions-toolkit.git?ref=refs/heads/master&checksum=860c1904a1ce19322e91ac35af1ab07466440c37&subdir=subdir'],
+    [{ref: 'refs/heads/master', format: 'query', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, subdir: '.'}, 'https://github.com/docker/actions-toolkit.git?ref=refs/heads/master&checksum=860c1904a1ce19322e91ac35af1ab07466440c37'],
     [{ref: 'refs/heads/master', format: 'query', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, subdir: 'subdir', keepGitDir: true}, 'https://github.com/docker/actions-toolkit.git?ref=refs/heads/master&checksum=860c1904a1ce19322e91ac35af1ab07466440c37&subdir=subdir&keep-git-dir=true'],
     [{ref: 'refs/heads/master', format: 'query', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, submodules: true}, 'https://github.com/docker/actions-toolkit.git?ref=refs/heads/master&checksum=860c1904a1ce19322e91ac35af1ab07466440c37&submodules=true'],
     [{ref: 'refs/heads/master', format: 'query', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, submodules: false}, 'https://github.com/docker/actions-toolkit.git?ref=refs/heads/master&checksum=860c1904a1ce19322e91ac35af1ab07466440c37&submodules=false'],
@@ -103,6 +104,7 @@ describe('gitContext', () => {
     [{ref: 'refs/tags/v1.0.0', format: 'fragment', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true}, 'https://github.com/docker/actions-toolkit.git#860c1904a1ce19322e91ac35af1ab07466440c37'],
     [{ref: 'refs/pull/15/merge', format: 'fragment', prHeadRef: true, sendGitQueryAsInput: false, buildxQuerySupport: true}, 'https://github.com/docker/actions-toolkit.git#refs/pull/15/head'],
     [{ref: 'refs/heads/master', format: 'fragment', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, subdir: 'subdir'}, 'https://github.com/docker/actions-toolkit.git#860c1904a1ce19322e91ac35af1ab07466440c37:subdir'],
+    [{ref: 'refs/heads/master', format: 'fragment', prHeadRef: false, sendGitQueryAsInput: false, buildxQuerySupport: true, subdir: '.'}, 'https://github.com/docker/actions-toolkit.git#860c1904a1ce19322e91ac35af1ab07466440c37'],
     [{ref: 'refs/pull/15/merge', format: 'fragment', prHeadRef: true, sendGitQueryAsInput: false, buildxQuerySupport: true, subdir: 'subdir'}, 'https://github.com/docker/actions-toolkit.git#refs/pull/15/head:subdir'],
   ];
 
diff --git a/src/buildx/build.ts b/src/buildx/build.ts
index aeb9abc4..5e23f16c 100644
--- a/src/buildx/build.ts
+++ b/src/buildx/build.ts
@@ -84,7 +84,7 @@ export class Build {
       if (gitChecksum) {
         query.push(`checksum=${gitChecksum}`);
       }
-      if (opts?.subdir) {
+      if (opts?.subdir && opts.subdir !== '.') {
         query.push(`subdir=${opts.subdir}`);
       }
       if (typeof opts?.keepGitDir !== 'undefined') {
@@ -96,7 +96,7 @@ export class Build {
       return `${baseURL}?${query.join('&')}`;
     }
     const fragmentRef = gitChecksum && !ref.startsWith(`refs/pull/`) ? gitChecksum : ref;
-    return `${baseURL}#${fragmentRef}${opts?.subdir ? `:${opts.subdir}` : ''}`;
+    return `${baseURL}#${fragmentRef}${opts?.subdir && opts.subdir !== '.' ? `:${opts.subdir}` : ''}`;
   }
 
   public getImageIDFilePath(): string {