diff --git a/src/finalisers/amd.ts b/src/finalisers/amd.ts
index 879fdfca090..5b2aa11da2b 100644
--- a/src/finalisers/amd.ts
+++ b/src/finalisers/amd.ts
@@ -3,18 +3,9 @@ import { NormalizedOutputOptions } from '../rollup/types';
 import { FinaliserOptions } from './index';
 import { getExportBlock, getNamespaceMarkers } from './shared/getExportBlock';
 import getInteropBlock from './shared/getInteropBlock';
+import removeExtensionFromRelativeAmdId from './shared/removeExtensionFromRelativeAmdId';
 import warnOnBuiltins from './shared/warnOnBuiltins';
 
-// AMD resolution will only respect the AMD baseUrl if the .js extension is omitted.
-// The assumption is that this makes sense for all relative ids:
-// https://requirejs.org/docs/api.html#jsfiles
-function removeExtensionFromRelativeAmdId(id: string) {
-	if (id[0] === '.' && id.endsWith('.js')) {
-		return id.slice(0, -3);
-	}
-	return id;
-}
-
 export default function amd(
 	magicString: MagicStringBundle,
 	{
diff --git a/src/finalisers/shared/removeExtensionFromRelativeAmdId.ts b/src/finalisers/shared/removeExtensionFromRelativeAmdId.ts
new file mode 100644
index 00000000000..e18b64c73cd
--- /dev/null
+++ b/src/finalisers/shared/removeExtensionFromRelativeAmdId.ts
@@ -0,0 +1,9 @@
+// AMD resolution will only respect the AMD baseUrl if the .js extension is omitted.
+// The assumption is that this makes sense for all relative ids:
+// https://requirejs.org/docs/api.html#jsfiles
+export default function removeExtensionFromRelativeAmdId(id: string) {
+	if (id[0] === '.' && id.endsWith('.js')) {
+		return id.slice(0, -3);
+	}
+	return id;
+}
diff --git a/src/finalisers/umd.ts b/src/finalisers/umd.ts
index a6b980b1c1c..bf9efad0d76 100644
--- a/src/finalisers/umd.ts
+++ b/src/finalisers/umd.ts
@@ -1,9 +1,11 @@
 import { Bundle as MagicStringBundle } from 'magic-string';
 import { NormalizedOutputOptions } from '../rollup/types';
 import { error } from '../utils/error';
+import { renderNamePattern } from '../utils/renderNamePattern';
 import { FinaliserOptions } from './index';
 import { getExportBlock, getNamespaceMarkers } from './shared/getExportBlock';
 import getInteropBlock from './shared/getInteropBlock';
+import removeExtensionFromRelativeAmdId from './shared/removeExtensionFromRelativeAmdId';
 import { keypath, property } from './shared/sanitize';
 import { assignToDeepVariable } from './shared/setupNamespace';
 import trimEmptyImports from './shared/trimEmptyImports';
@@ -66,7 +68,7 @@ export default function umd(
 
 	warnOnBuiltins(warn, dependencies);
 
-	const amdDeps = dependencies.map(m => `'${m.id}'`);
+	const amdDeps = dependencies.map(m => `'${removeExtensionFromRelativeAmdId(m.id)}'`);
 	const cjsDeps = dependencies.map(m => `require('${m.id}')`);
 
 	const trimmedImports = trimEmptyImports(dependencies);
diff --git a/test/form/samples/guessed-global-names/_expected/umd.js b/test/form/samples/guessed-global-names/_expected/umd.js
index 9e3a3dd1847..212291e1020 100644
--- a/test/form/samples/guessed-global-names/_expected/umd.js
+++ b/test/form/samples/guessed-global-names/_expected/umd.js
@@ -1,5 +1,5 @@
 (function (global, factory) {
-	typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('unchanged'), require('changed'), require('special-character'), require('with/slash'), require('./relative.js')) :
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('unchanged'), require('changed'), require('special-character'), require('with/slash'), require('./relative')) :
 	typeof define === 'function' && define.amd ? define(['unchanged', 'changed', 'special-character', 'with/slash', './relative.js'], factory) :
 	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.unchanged, global.changedName, global.specialCharacter, global.slash, global.relative_js));
 }(this, (function (unchanged, changedName, specialCharacter, slash, relative_js) { 'use strict';
diff --git a/test/form/samples/relative-external-with-global/_expected/umd.js b/test/form/samples/relative-external-with-global/_expected/umd.js
index 7cfe226ab68..4e56304a94f 100644
--- a/test/form/samples/relative-external-with-global/_expected/umd.js
+++ b/test/form/samples/relative-external-with-global/_expected/umd.js
@@ -1,6 +1,6 @@
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(require('./lib/throttle.js')) :
-	typeof define === 'function' && define.amd ? define(['./lib/throttle.js'], factory) :
+	typeof define === 'function' && define.amd ? define(['./lib/throttle'], factory) :
 	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.Lib.throttle));
 }(this, (function (throttle) { 'use strict';