diff --git a/fastapi/routing.py b/fastapi/routing.py
index 6d252d817..67619bda5 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -271,6 +271,10 @@ class APIRouter(routing.Router):
                     include_in_schema=route.include_in_schema,
                     name=route.name,
                 )
+            elif isinstance(route, routing.WebSocketRoute):
+                self.add_websocket_route(
+                    prefix + route.path, route.endpoint, name=route.name
+                )
 
     def get(
         self,
diff --git a/tests/test_ws_router.py b/tests/test_ws_router.py
new file mode 100644
index 000000000..d3c69ca1f
--- /dev/null
+++ b/tests/test_ws_router.py
@@ -0,0 +1,53 @@
+from fastapi import APIRouter, FastAPI
+from starlette.testclient import TestClient
+from starlette.websockets import WebSocket
+
+router = APIRouter()
+prefix_router = APIRouter()
+app = FastAPI()
+
+
+@app.websocket_route("/")
+async def index(websocket: WebSocket):
+    await websocket.accept()
+    await websocket.send_text("Hello, world!")
+    await websocket.close()
+
+
+@router.websocket_route("/router")
+async def routerindex(websocket: WebSocket):
+    await websocket.accept()
+    await websocket.send_text("Hello, router!")
+    await websocket.close()
+
+
+@prefix_router.websocket_route("/")
+async def routerprefixindex(websocket: WebSocket):
+    await websocket.accept()
+    await websocket.send_text("Hello, router with prefix!")
+    await websocket.close()
+
+
+app.include_router(router)
+app.include_router(prefix_router, prefix="/prefix")
+
+
+def test_app():
+    client = TestClient(app)
+    with client.websocket_connect("/") as websocket:
+        data = websocket.receive_text()
+        assert data == "Hello, world!"
+
+
+def test_router():
+    client = TestClient(app)
+    with client.websocket_connect("/router") as websocket:
+        data = websocket.receive_text()
+        assert data == "Hello, router!"
+
+
+def test_prefix_router():
+    client = TestClient(app)
+    with client.websocket_connect("/prefix/") as websocket:
+        data = websocket.receive_text()
+        assert data == "Hello, router with prefix!"