diff --git a/src/utils/set.ts b/src/utils/set.ts
index 7d465a56..e48ffe55 100644
--- a/src/utils/set.ts
+++ b/src/utils/set.ts
@@ -25,7 +25,12 @@ function internalSet<Entity = any, Output = Entity, Value = any>(
 
   // Delete prop if `removeIfUndefined` and value is undefined
   if (removeIfUndefined && value === undefined && restPath.length === 1) {
-    delete clone[path][restPath[0]];
+    const origin = clone[path];
+    if (origin && typeof origin === 'object') {
+      const child = Array.isArray(origin) ? [...origin] : { ...origin };
+      delete child[restPath[0]];
+      clone[path] = child;
+    }
   } else {
     clone[path] = internalSet(clone[path], restPath, value, removeIfUndefined);
   }
diff --git a/tests/utils.test.ts b/tests/utils.test.ts
index f0d4385f..248cb8f0 100644
--- a/tests/utils.test.ts
+++ b/tests/utils.test.ts
@@ -59,14 +59,12 @@ describe('utils', () => {
       expect(set({}, ['notExist'], undefined, true)).toEqual({});
 
       // Delete value
-      const target = set(
-        { keep: { light: 2333 } },
-        ['keep', 'light'],
-        undefined,
-        true,
-      );
-      expect(target).toEqual({ keep: {} });
+      const source = { keep: { light: 2333, bamboo: 1 } };
+      const target = set(source, ['keep', 'light'], undefined, true);
+      expect(target).toEqual({ keep: { bamboo: 1 } });
       expect('light' in target.keep).toBeFalsy();
+      expect(source).toEqual({ keep: { light: 2333, bamboo: 1 } });
+      expect(target.keep).not.toBe(source.keep);
 
       // Mid path not exist
       const midTgt = set(
@@ -99,6 +97,16 @@ describe('utils', () => {
       expect('lv4' in longTgt.lv1.lv2.lv3).toBeFalsy();
     });
 
+    it.each(['str', 123, true, Symbol('value'), BigInt(1)])(
+      'preserves a primitive parent when removing a missing property: %s',
+      value => {
+        const source = { keep: value };
+        const target = set(source, ['keep', 'light'], undefined, true);
+        expect(target.keep).toBe(value);
+        expect(source.keep).toBe(value);
+      },
+    );
+
     describe('merge', () => {
       it('basic', () => {
         const merged = merge({}, { a: 1 }, { b: 2 });