diff --git a/src/fpga/api/fpga_api.h b/src/fpga/api/fpga_api.h
index 3192b4780784a755f9fd3dcae9d4d687f8276400..3db15c6ddc1843a5b6e91b0267ddbc0e606d87f8 100644
--- a/src/fpga/api/fpga_api.h
+++ b/src/fpga/api/fpga_api.h
@@ -81,6 +81,7 @@ struct ConvArgs {
 
   struct BNArgs bn;
   struct ImageInputArgs image;  // input image;
+  struct ImageOutputArgs output;
   struct KernelArgs kernel;
 };