diff --git a/hack/update-codegen.sh b/hack/update-codegen.sh
index 62c36633f..302850054 100755
--- a/hack/update-codegen.sh
+++ b/hack/update-codegen.sh
@@ -10,7 +10,7 @@ cd "${REPO_ROOT}"
 
 echo "Generating with deepcopy-gen"
 GO111MODULE=on go install k8s.io/code-generator/cmd/deepcopy-gen
-GOPATH=$(go env GOPATH | awk -F ':' '{print $1}')
+export GOPATH=$(go env GOPATH | awk -F ':' '{print $1}')
 export PATH=$PATH:$GOPATH/bin
 
 deepcopy-gen \