diff --git a/libavfilter/dnn_filter_common.c b/libavfilter/dnn_filter_common.c
index 0ed0ac2e30..fcee7482c3 100644
--- a/libavfilter/dnn_filter_common.c
+++ b/libavfilter/dnn_filter_common.c
@@ -153,7 +153,7 @@ DNNReturnType ff_dnn_execute_model_async(DnnContext *ctx, AVFrame *in_frame, AVF
     return (ctx->dnn_module->execute_model_async)(ctx->model, &exec_params);
 }
 
-DNNReturnType ff_dnn_execute_model_classification(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame, char *target)
+DNNReturnType ff_dnn_execute_model_classification(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame, const char *target)
 {
     DNNExecClassificationParams class_params = {
         {
diff --git a/libavfilter/dnn_filter_common.h b/libavfilter/dnn_filter_common.h
index 36319bfef8..8e43d8c8dc 100644
--- a/libavfilter/dnn_filter_common.h
+++ b/libavfilter/dnn_filter_common.h
@@ -57,7 +57,7 @@ DNNReturnType ff_dnn_get_input(DnnContext *ctx, DNNData *input);
 DNNReturnType ff_dnn_get_output(DnnContext *ctx, int input_width, int input_height, int *output_width, int *output_height);
 DNNReturnType ff_dnn_execute_model(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame);
 DNNReturnType ff_dnn_execute_model_async(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame);
-DNNReturnType ff_dnn_execute_model_classification(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame, char *target);
+DNNReturnType ff_dnn_execute_model_classification(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame, const char *target);
 DNNAsyncStatusType ff_dnn_get_async_result(DnnContext *ctx, AVFrame **in_frame, AVFrame **out_frame);
 DNNReturnType ff_dnn_flush(DnnContext *ctx);
 void ff_dnn_uninit(DnnContext *ctx);