diff --git a/packages/compiler-cli/ngcc/src/locking/async_locker.ts b/packages/compiler-cli/ngcc/src/locking/async_locker.ts
index f0ee1b7393..36a8c8faf5 100644
--- a/packages/compiler-cli/ngcc/src/locking/async_locker.ts
+++ b/packages/compiler-cli/ngcc/src/locking/async_locker.ts
@@ -52,7 +52,9 @@ export class AsyncLocker {
         if (attempts === 0) {
           this.logger.info(
               `Another process, with id ${pid}, is currently running ngcc.\n` +
-              `Waiting up to ${this.retryDelay * this.retryAttempts / 1000}s for it to finish.`);
+              `Waiting up to ${this.retryDelay * this.retryAttempts / 1000}s for it to finish.\n` +
+              `(If you are sure no ngcc process is running then you should delete the lock-file at ${
+                  this.lockFile.path}.)`);
         }
         // The file is still locked by another process so wait for a bit and retry
         await new Promise(resolve => setTimeout(resolve, this.retryDelay));
diff --git a/packages/compiler-cli/ngcc/test/locking/async_locker_spec.ts b/packages/compiler-cli/ngcc/test/locking/async_locker_spec.ts
index a77b34c5d8..9f359b37d8 100644
--- a/packages/compiler-cli/ngcc/test/locking/async_locker_spec.ts
+++ b/packages/compiler-cli/ngcc/test/locking/async_locker_spec.ts
@@ -76,7 +76,9 @@ runInEachFileSystem(() => {
         // The lock is now waiting on the lock-file becoming free, so no `fn()` in the log.
         expect(log).toEqual(['write()', 'read() => 188']);
         expect(logger.logs.info).toEqual([[
-          'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.'
+          'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
+          `(If you are sure no ngcc process is running then you should delete the lock-file at ${
+              lockFile.path}.)`
         ]]);
 
         lockFileContents = null;
@@ -112,7 +114,9 @@ runInEachFileSystem(() => {
         // The lock is now waiting on the lock-file becoming free, so no `fn()` in the log.
         expect(log).toEqual(['write()', 'read() => 188']);
         expect(logger.logs.info).toEqual([[
-          'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.'
+          'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
+          `(If you are sure no ngcc process is running then you should delete the lock-file at ${
+              lockFile.path}.)`
         ]]);
 
         lockFileContents = '444';
@@ -120,12 +124,12 @@ runInEachFileSystem(() => {
         await new Promise(resolve => setTimeout(resolve, 250));
         expect(log).toEqual(['write()', 'read() => 188', 'write()', 'read() => 444']);
         expect(logger.logs.info).toEqual([
-          [
-            'Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.'
-          ],
-          [
-            'Another process, with id 444, is currently running ngcc.\nWaiting up to 1s for it to finish.'
-          ]
+          ['Another process, with id 188, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
+           `(If you are sure no ngcc process is running then you should delete the lock-file at ${
+               lockFile.path}.)`],
+          ['Another process, with id 444, is currently running ngcc.\nWaiting up to 1s for it to finish.\n' +
+           `(If you are sure no ngcc process is running then you should delete the lock-file at ${
+               lockFile.path}.)`]
         ]);
 
         lockFileContents = null;