diff --git a/packages/third-parties/socketio/src/class/SocketHandlersBuilder.spec.ts b/packages/third-parties/socketio/src/class/SocketHandlersBuilder.spec.ts
index a166c826cc1..0e606964693 100644
--- a/packages/third-parties/socketio/src/class/SocketHandlersBuilder.spec.ts
+++ b/packages/third-parties/socketio/src/class/SocketHandlersBuilder.spec.ts
@@ -925,7 +925,7 @@ describe("SocketHandlersBuilder", () => {
     });
   });
   describe("deserialize()", () => {
-    it("should call ConverterService.deserialize", () => {
+    it("should call deserialize on args", () => {
       const provider: any = {
         store: {
           get: jest.fn()
@@ -953,5 +953,34 @@ describe("SocketHandlersBuilder", () => {
         args: [["any"]]
       });
     });
+
+    it("should map ack callback without deserialization", () => {
+      const provider: any = {
+        store: {
+          get: jest.fn()
+        }
+      };
+      const parameters: any[] = [
+        {
+          filter: SocketFilters.ARGS,
+          useMapper: true,
+          mapIndex: 0,
+          type: Function
+        }
+      ];
+      const ack = () => {};
+      const scope: any = {
+        args: [ack]
+      };
+
+      const builder = new SocketHandlersBuilder(provider, PlatformTest.injector);
+
+      // @ts-ignore
+      builder.deserialize({parameters} as any, scope as any);
+
+      expect(scope).toEqual({
+        args: [ack]
+      });
+    });
   });
 });
diff --git a/packages/third-parties/socketio/src/class/SocketHandlersBuilder.ts b/packages/third-parties/socketio/src/class/SocketHandlersBuilder.ts
index 617ff36b666..3b70008f6c4 100644
--- a/packages/third-parties/socketio/src/class/SocketHandlersBuilder.ts
+++ b/packages/third-parties/socketio/src/class/SocketHandlersBuilder.ts
@@ -168,12 +168,14 @@ export class SocketHandlersBuilder {
       const {filter, useMapper, mapIndex, type, collectionType} = parameters![index];
       let value = scope.args[mapIndex!];
 
-      if (filter === SocketFilters.ARGS && useMapper) {
-        value = deserialize(value, {
-          type,
-          collectionType,
-          useAlias: true
-        });
+      if (filter === SocketFilters.ARGS) {
+        if (useMapper && typeof value !== "function") {
+          value = deserialize(value, {
+            type,
+            collectionType,
+            useAlias: true
+          });
+        }
         scope.args[mapIndex!] = value;
       }
     });