diff --git a/README.md b/README.md
index febea83ab5..711799511e 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,7 @@ I'm open to contributions.
   - [a routing guard](#how-to-test-a-routing-guard)
   - [a routing resolver](#how-to-test-a-routing-resolver)
   - [a http request](#how-to-test-a-http-request)
+  - [a http interceptor](#how-to-test-a-http-interceptor)
 
 ---
 
@@ -1380,6 +1381,13 @@ beforeEach(() =>
 // at all? The answer is to exclude `NG_GUARDS` token, it will removal
 // all the guards from routes except the explicitly configured ones.
 beforeEach(() => MockBuilder(MyGuard, MyModule).exclude(NG_GUARDS));
+// The same thing if we want to test interceptors. If we exclude
+// `NG_INTERCEPTORS` token, then all interceptors with `useValue` or
+// `useFactory` will be excluded together with other interceptors
+// except the explicitly configured ones.
+beforeEach(() =>
+  MockBuilder(MyInterceptor, MyModule).exclude(NG_INTERCEPTORS)
+);
 
 // If we want to replace something with something,
 // we should use .replace.
diff --git a/examples/TestHttpInterceptor/test.spec.ts b/examples/TestHttpInterceptor/test.spec.ts
index 0f547c322d..82f5742acc 100644
--- a/examples/TestHttpInterceptor/test.spec.ts
+++ b/examples/TestHttpInterceptor/test.spec.ts
@@ -10,7 +10,7 @@ import {
 import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
 import { Injectable, NgModule } from '@angular/core';
 import { TestBed } from '@angular/core/testing';
-import { MockBuilder } from 'ng-mocks';
+import { MockBuilder, NG_INTERCEPTORS } from 'ng-mocks';
 import { Observable } from 'rxjs';
 
 // An interceptor we want to test.
@@ -29,15 +29,37 @@ class TargetInterceptor implements HttpInterceptor {
   }
 }
 
+// An interceptor we want to ignore.
+@Injectable()
+class MockedInterceptor implements HttpInterceptor {
+  protected value = 'Ignore';
+
+  public intercept(request: HttpRequest<void>, next: HttpHandler): Observable<HttpEvent<void>> {
+    return next.handle(
+      request.clone({
+        setHeaders: {
+          'My-Mocked': this.value,
+        },
+      })
+    );
+  }
+}
+
 // A module with its definition.
 @NgModule({
   imports: [HttpClientModule],
   providers: [
     TargetInterceptor,
+    MockedInterceptor,
+    {
+      multi: true,
+      provide: HTTP_INTERCEPTORS,
+      useExisting: TargetInterceptor,
+    },
     {
       multi: true,
       provide: HTTP_INTERCEPTORS,
-      useClass: TargetInterceptor,
+      useExisting: MockedInterceptor,
     },
   ],
 })
@@ -51,6 +73,7 @@ describe('TestHttpInterceptor', () => {
   // with HttpClientTestingModule.
   beforeEach(() =>
     MockBuilder(TargetInterceptor, TargetModule)
+      .exclude(NG_INTERCEPTORS)
       .keep(HTTP_INTERCEPTORS)
       .replace(HttpClientModule, HttpClientTestingModule)
   );
diff --git a/lib/mock-service/mock-service.ts b/lib/mock-service/mock-service.ts
index f7db3e8d06..94509b77cf 100644
--- a/lib/mock-service/mock-service.ts
+++ b/lib/mock-service/mock-service.ts
@@ -1,6 +1,6 @@
 import { Injector, Provider } from '@angular/core';
 
-import { isNgInjectionToken, NG_GUARDS } from '../common';
+import { isNgInjectionToken, NG_GUARDS, NG_INTERCEPTORS } from '../common';
 import { ngMocksUniverse } from '../common/ng-mocks-universe';
 import { MockProvider } from '../mock-module';
 
@@ -310,6 +310,30 @@ const mockServiceHelperPrototype = {
       return;
     }
 
+    if (
+      ngMocksUniverse.builder.has(NG_INTERCEPTORS) &&
+      ngMocksUniverse.builder.get(NG_INTERCEPTORS) === null &&
+      isNgInjectionToken(provider) &&
+      provider.toString() === 'InjectionToken HTTP_INTERCEPTORS' &&
+      provider !== def
+    ) {
+      const interceptor = def.useExisting || def.useClass;
+      if (!ngMocksUniverse.builder.has(interceptor) || ngMocksUniverse.builder.get(interceptor) === null) {
+        /* istanbul ignore else */
+        if (changed) {
+          changed(true);
+        }
+        return;
+      }
+      if (def.useFactory || def.useValue) {
+        /* istanbul ignore else */
+        if (changed) {
+          changed(true);
+        }
+        return;
+      }
+    }
+
     ngMocksUniverse.touches.add(provider);
 
     // Then we check decisions whether we should keep or replace a def.