diff --git a/Makefile b/Makefile
index 83bd5bd04..4071713d0 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ MAIN_PKG=cmd/manager/main.go
 export NAMESPACE?=openshift-sriov-network-operator
 export WATCH_NAMESPACE?=openshift-sriov-network-operator
 export ENABLE_ADMISSION_CONTROLLER?=true
-export GOFLAGS=-mod=vendor
+export GOFLAGS+=-mod=vendor
 export GO111MODULE=on
 PKGS=$(shell go list ./... | grep -v -E '/vendor/|/test|/examples')