diff --git a/docker/iroha-builder/Dockerfile b/docker/iroha-builder/Dockerfile
index 1ec6acd4929..15ac01f41eb 100644
--- a/docker/iroha-builder/Dockerfile
+++ b/docker/iroha-builder/Dockerfile
@@ -45,6 +45,7 @@ ENV GOPATH=/opt/gopath
 RUN mkdir ${GOPATH}
 ENV PATH=${PATH}:/opt/go/bin:${GOPATH}/bin
 RUN go get github.com/golang/protobuf/protoc-gen-go
+RUN go mod download github.com/golang/protobuf
 RUN export PATH="$PATH:$(go env GOPATH)/bin" # according to: https://grpc.io/docs/languages/go/quickstart/
 
 ## Rust-lang stuff for iroha+ursa