diff --git a/src/layer/topk.cpp b/src/layer/topk.cpp
index 481794dfc35..4150db63aab 100644
--- a/src/layer/topk.cpp
+++ b/src/layer/topk.cpp
@@ -13,6 +13,8 @@
 // specific language governing permissions and limitations under the License.
 
 #include "topk.h"
+#include <vector>
+#include <algorithm>
 
 namespace ncnn {