diff --git a/lib/utils/config/definitions.js b/lib/utils/config/definitions.js
index 74a4c6b8dc6aa..9ec938a6ce917 100644
--- a/lib/utils/config/definitions.js
+++ b/lib/utils/config/definitions.js
@@ -1353,7 +1353,11 @@ define('package-lock', {
     modules will also be disabled.  To remove extraneous modules with
     package-locks disabled use \`npm prune\`.
   `,
-  flatten,
+  flatten: (key, obj, flatOptions) => {
+    flatten(key, obj, flatOptions)
+    if (flatOptions.packageLockOnly)
+      flatOptions.packageLock = true
+  },
 })
 
 define('package-lock-only', {
@@ -1369,7 +1373,11 @@ define('package-lock-only', {
     For \`list\` this means the output will be based on the tree described by the
     \`package-lock.json\`, rather than the contents of \`node_modules\`.
   `,
-  flatten,
+  flatten: (key, obj, flatOptions) => {
+    flatten(key, obj, flatOptions)
+    if (flatOptions.packageLockOnly)
+      flatOptions.packageLock = true
+  },
 })
 
 define('pack-destination', {
diff --git a/test/lib/utils/config/definitions.js b/test/lib/utils/config/definitions.js
index a32e55c29f8d6..65193020d050c 100644
--- a/test/lib/utils/config/definitions.js
+++ b/test/lib/utils/config/definitions.js
@@ -832,3 +832,24 @@ t.test('location', t => {
   t.strictSame(obj, { global: false, location: 'user' })
   t.end()
 })
+
+t.test('package-lock-only', t => {
+  const obj = {
+    'package-lock': false,
+    'package-lock-only': true,
+  }
+  const flat = {}
+
+  definitions['package-lock-only'].flatten('package-lock-only', obj, flat)
+  definitions['package-lock'].flatten('package-lock', obj, flat)
+  t.strictSame(flat, { packageLock: true, packageLockOnly: true })
+
+  obj['package-lock-only'] = false
+  delete flat.packageLock
+  delete flat.packageLockOnly
+
+  definitions['package-lock-only'].flatten('package-lock-only', obj, flat)
+  definitions['package-lock'].flatten('package-lock', obj, flat)
+  t.strictSame(flat, { packageLock: false, packageLockOnly: false })
+  t.end()
+})