diff --git a/.changeset/long-donkeys-bathe.md b/.changeset/long-donkeys-bathe.md
new file mode 100644
index 000000000..ec40a158d
--- /dev/null
+++ b/.changeset/long-donkeys-bathe.md
@@ -0,0 +1,5 @@
+---
+"@redocly/cli": patch
+---
+
+Fixed an issue where `join` would throw an error when a glob pattern was provided.
diff --git a/packages/cli/src/__tests__/commands/join.test.ts b/packages/cli/src/__tests__/commands/join.test.ts
index 8980be4cc..6d42a389b 100644
--- a/packages/cli/src/__tests__/commands/join.test.ts
+++ b/packages/cli/src/__tests__/commands/join.test.ts
@@ -1,7 +1,11 @@
 import { yellow } from 'colorette';
 import { detectSpec } from '@redocly/openapi-core';
 import { handleJoin } from '../../commands/join';
-import { exitWithError, writeToFileByExtension } from '../../utils/miscellaneous';
+import {
+  exitWithError,
+  getFallbackApisOrExit,
+  writeToFileByExtension,
+} from '../../utils/miscellaneous';
 import { loadConfig } from '../../__mocks__/@redocly/openapi-core';
 import { ConfigFixture } from '../fixtures/config';
 
@@ -15,7 +19,35 @@ describe('handleJoin', () => {
 
   it('should call exitWithError because only one entrypoint', async () => {
     await handleJoin({ argv: { apis: ['first.yaml'] }, config: {} as any, version: 'cli-version' });
-    expect(exitWithError).toHaveBeenCalledWith(`At least 2 apis should be provided.`);
+    expect(exitWithError).toHaveBeenCalledWith(`At least 2 APIs should be provided.`);
+  });
+
+  it('should call exitWithError if glob expands to less than 2 APIs', async () => {
+    (getFallbackApisOrExit as jest.Mock).mockResolvedValueOnce([{ path: 'first.yaml' }]);
+
+    await handleJoin({
+      argv: { apis: ['*.yaml'] },
+      config: {} as any,
+      version: 'cli-version',
+    });
+
+    expect(exitWithError).toHaveBeenCalledWith(`At least 2 APIs should be provided.`);
+  });
+
+  it('should proceed if glob expands to 2 or more APIs', async () => {
+    (detectSpec as jest.Mock).mockReturnValue('oas3_1');
+    (getFallbackApisOrExit as jest.Mock).mockResolvedValueOnce([
+      { path: 'first.yaml' },
+      { path: 'second.yaml' },
+    ]);
+
+    await handleJoin({
+      argv: { apis: ['*.yaml'] },
+      config: ConfigFixture as any,
+      version: 'cli-version',
+    });
+
+    expect(exitWithError).not.toHaveBeenCalled();
   });
 
   it('should call exitWithError because passed all 3 options for tags', async () => {
@@ -52,6 +84,7 @@ describe('handleJoin', () => {
   });
 
   it('should call exitWithError because Only OpenAPI 3.0 and OpenAPI 3.1 are supported', async () => {
+    (detectSpec as jest.Mock).mockReturnValueOnce('oas2_0');
     await handleJoin({
       argv: {
         apis: ['first.yaml', 'second.yaml'],
diff --git a/packages/cli/src/commands/join.ts b/packages/cli/src/commands/join.ts
index 07d866e48..8671e0a35 100644
--- a/packages/cli/src/commands/join.ts
+++ b/packages/cli/src/commands/join.ts
@@ -64,18 +64,12 @@ export async function handleJoin({
 }: CommandArgs<JoinOptions>) {
   const startedAt = performance.now();
 
-  if (argv.apis.length < 2) {
-    return exitWithError(`At least 2 apis should be provided.`);
-  }
-
-  const fileExtension = getAndValidateFileExtension(argv.output || argv.apis[0]);
-
   const {
     'prefix-components-with-info-prop': prefixComponentsWithInfoProp,
     'prefix-tags-with-filename': prefixTagsWithFilename,
     'prefix-tags-with-info-prop': prefixTagsWithInfoProp,
     'without-x-tag-groups': withoutXTagGroups,
-    output: specFilename = `openapi.${fileExtension}`,
+    output,
   } = argv;
 
   const usedTagsOptions = [
@@ -91,6 +85,13 @@ export async function handleJoin({
   }
 
   const apis = await getFallbackApisOrExit(argv.apis, config);
+  if (apis.length < 2) {
+    return exitWithError(`At least 2 APIs should be provided.`);
+  }
+
+  const fileExtension = getAndValidateFileExtension(output || apis[0].path);
+  const specFilename = output || `openapi.${fileExtension}`;
+
   const externalRefResolver = new BaseResolver(config.resolve);
   const documents = await Promise.all(
     apis.map(