diff --git a/packages/microservices/decorators/event-pattern.decorator.ts b/packages/microservices/decorators/event-pattern.decorator.ts
index cf04e1fc7ed..ead1830b911 100644
--- a/packages/microservices/decorators/event-pattern.decorator.ts
+++ b/packages/microservices/decorators/event-pattern.decorator.ts
@@ -61,7 +61,14 @@ export const EventPattern: {
       descriptor.value,
     );
     Reflect.defineMetadata(TRANSPORT_METADATA, transport, descriptor.value);
-    Reflect.defineMetadata(PATTERN_EXTRAS_METADATA, extras, descriptor.value);
+    Reflect.defineMetadata(
+      PATTERN_EXTRAS_METADATA,
+      {
+        ...Reflect.getMetadata(PATTERN_EXTRAS_METADATA, descriptor.value),
+        ...extras,
+      },
+      descriptor.value,
+    );
     return descriptor;
   };
 };
diff --git a/packages/microservices/decorators/message-pattern.decorator.ts b/packages/microservices/decorators/message-pattern.decorator.ts
index 75773090818..86d460f1f28 100644
--- a/packages/microservices/decorators/message-pattern.decorator.ts
+++ b/packages/microservices/decorators/message-pattern.decorator.ts
@@ -75,7 +75,14 @@ export const MessagePattern: {
       descriptor.value,
     );
     Reflect.defineMetadata(TRANSPORT_METADATA, transport, descriptor.value);
-    Reflect.defineMetadata(PATTERN_EXTRAS_METADATA, extras, descriptor.value);
+    Reflect.defineMetadata(
+      PATTERN_EXTRAS_METADATA,
+      {
+        ...Reflect.getMetadata(PATTERN_EXTRAS_METADATA, descriptor.value),
+        ...extras,
+      },
+      descriptor.value,
+    );
     return descriptor;
   };
 };
diff --git a/packages/microservices/test/decorators/event-pattern.decorator.spec.ts b/packages/microservices/test/decorators/event-pattern.decorator.spec.ts
index dbfb076969f..3a78e602d2d 100644
--- a/packages/microservices/test/decorators/event-pattern.decorator.spec.ts
+++ b/packages/microservices/test/decorators/event-pattern.decorator.spec.ts
@@ -54,6 +54,8 @@ describe('@EventPattern', () => {
   });
 
   describe('decorator overloads', () => {
+    const additionalExtras = { foo: 'bar' };
+
     class TestComponent1 {
       @EventPattern(pattern)
       public static test() {}
@@ -70,6 +72,18 @@ describe('@EventPattern', () => {
       @EventPattern(pattern, Transport.TCP, extras)
       public static test() {}
     }
+    class TestComponent5 {
+      @EventPattern(pattern, Transport.TCP, extras)
+      @((
+        (): MethodDecorator => (_target, _key, descriptor) =>
+          Reflect.defineMetadata(
+            PATTERN_EXTRAS_METADATA,
+            additionalExtras,
+            descriptor.value,
+          )
+      )())
+      public static test() {}
+    }
 
     it(`should enhance method with ${PATTERN_METADATA} metadata`, () => {
       const [metadataArg] = Reflect.getMetadata(
@@ -86,7 +100,7 @@ describe('@EventPattern', () => {
       );
       expect(metadataArg).to.be.eql(pattern);
       expect(transportArg).to.be.undefined;
-      expect(extrasArg).to.be.undefined;
+      expect(extrasArg).to.be.eql({});
     });
 
     it(`should enhance method with ${PATTERN_METADATA}, ${TRANSPORT_METADATA} metadata`, () => {
@@ -104,7 +118,7 @@ describe('@EventPattern', () => {
       );
       expect(metadataArg).to.be.eql(pattern);
       expect(transportArg).to.be.eql(Transport.TCP);
-      expect(extrasArg).to.be.undefined;
+      expect(extrasArg).to.be.eql({});
     });
 
     it(`should enhance method with ${PATTERN_METADATA}, ${PATTERN_EXTRAS_METADATA} metadata`, () => {
@@ -143,5 +157,26 @@ ${PATTERN_EXTRAS_METADATA} metadata`, () => {
       expect(transportArg).to.be.eql(Transport.TCP);
       expect(extrasArg).to.be.eql(extras);
     });
+
+    it(`should merge with existing ${PATTERN_EXTRAS_METADATA} metadata`, () => {
+      const [metadataArg] = Reflect.getMetadata(
+        PATTERN_METADATA,
+        TestComponent5.test,
+      );
+      const transportArg = Reflect.getMetadata(
+        TRANSPORT_METADATA,
+        TestComponent5.test,
+      );
+      const extrasArg = Reflect.getMetadata(
+        PATTERN_EXTRAS_METADATA,
+        TestComponent5.test,
+      );
+      expect(metadataArg).to.be.eql(pattern);
+      expect(transportArg).to.be.eql(Transport.TCP);
+      expect(extrasArg).to.be.eql({
+        ...additionalExtras,
+        ...extras,
+      });
+    });
   });
 });
diff --git a/packages/microservices/test/decorators/message-pattern.decorator.spec.ts b/packages/microservices/test/decorators/message-pattern.decorator.spec.ts
index d8b62d2f55e..4980c3ff10a 100644
--- a/packages/microservices/test/decorators/message-pattern.decorator.spec.ts
+++ b/packages/microservices/test/decorators/message-pattern.decorator.spec.ts
@@ -36,6 +36,8 @@ describe('@MessagePattern', () => {
   });
 
   describe('decorator overloads', () => {
+    const additionalExtras = { foo: 'bar' };
+
     class TestComponent1 {
       @MessagePattern(pattern)
       public static test() {}
@@ -52,6 +54,18 @@ describe('@MessagePattern', () => {
       @MessagePattern(pattern, Transport.TCP, extras)
       public static test() {}
     }
+    class TestComponent5 {
+      @MessagePattern(pattern, Transport.TCP, extras)
+      @((
+        (): MethodDecorator => (_target, _key, descriptor) =>
+          Reflect.defineMetadata(
+            PATTERN_EXTRAS_METADATA,
+            additionalExtras,
+            descriptor.value,
+          )
+      )())
+      public static test() {}
+    }
 
     it(`should enhance method with ${PATTERN_METADATA} metadata`, () => {
       const [metadataArg] = Reflect.getMetadata(
@@ -68,7 +82,7 @@ describe('@MessagePattern', () => {
       );
       expect(metadataArg).to.be.eql(pattern);
       expect(transportArg).to.be.undefined;
-      expect(extrasArg).to.be.undefined;
+      expect(extrasArg).to.be.eql({});
     });
 
     it(`should enhance method with ${PATTERN_METADATA}, ${TRANSPORT_METADATA} metadata`, () => {
@@ -86,7 +100,7 @@ describe('@MessagePattern', () => {
       );
       expect(metadataArg).to.be.eql(pattern);
       expect(transportArg).to.be.eql(Transport.TCP);
-      expect(extrasArg).to.be.undefined;
+      expect(extrasArg).to.be.eql({});
     });
 
     it(`should enhance method with ${PATTERN_METADATA}, ${PATTERN_EXTRAS_METADATA} metadata`, () => {
@@ -125,6 +139,27 @@ ${PATTERN_EXTRAS_METADATA} metadata`, () => {
       expect(transportArg).to.be.eql(Transport.TCP);
       expect(extrasArg).to.be.eql(extras);
     });
+
+    it(`should merge with existing ${PATTERN_EXTRAS_METADATA} metadata`, () => {
+      const [metadataArg] = Reflect.getMetadata(
+        PATTERN_METADATA,
+        TestComponent5.test,
+      );
+      const transportArg = Reflect.getMetadata(
+        TRANSPORT_METADATA,
+        TestComponent5.test,
+      );
+      const extrasArg = Reflect.getMetadata(
+        PATTERN_EXTRAS_METADATA,
+        TestComponent5.test,
+      );
+      expect(metadataArg).to.be.eql(pattern);
+      expect(transportArg).to.be.eql(Transport.TCP);
+      expect(extrasArg).to.be.eql({
+        ...additionalExtras,
+        ...extras,
+      });
+    });
   });
 });