diff --git a/cloudbuild-kubepkg.yaml b/cloudbuild-kubepkg.yaml
index 571d9f664e2..282bff88d09 100644
--- a/cloudbuild-kubepkg.yaml
+++ b/cloudbuild-kubepkg.yaml
@@ -8,22 +8,23 @@ steps:
     - build
     - -f
     - ./Dockerfile-kubepkg
-    - --tag=gcr.io/$PROJECT_ID/kubepkg:$_GIT_TAG
-    - --tag=gcr.io/$PROJECT_ID/kubepkg:latest
+    - --tag=$_REGISTRY/kubepkg:$_GIT_TAG
+    - --tag=$_REGISTRY/kubepkg:latest
     - .
   - name: gcr.io/cloud-builders/docker
     args:
     - build
     - -f
     - ./Dockerfile-kubepkg-rpm
-    - --tag=gcr.io/$PROJECT_ID/kubepkg-rpm:$_GIT_TAG
-    - --tag=gcr.io/$PROJECT_ID/kubepkg-rpm:latest
+    - --tag=$_REGISTRY/kubepkg-rpm:$_GIT_TAG
+    - --tag=$_REGISTRY/kubepkg-rpm:latest
     - .
 substitutions:
   # _GIT_TAG will be filled with a git-based tag for the image, of the form vYYYYMMDD-hash, and
   # can be used as a substitution
   _GIT_TAG: '12345'
   _PULL_BASE_REF: 'dev'
+  _REGISTRY: 'fake.repository/registry-name'
 images:
   - 'gcr.io/$PROJECT_ID/kubepkg:$_GIT_TAG'
   - 'gcr.io/$PROJECT_ID/kubepkg:latest'
diff --git a/images/releng/ci/cloudbuild.yaml b/images/releng/ci/cloudbuild.yaml
index 5a6e166629a..24bdf4334e1 100644
--- a/images/releng/ci/cloudbuild.yaml
+++ b/images/releng/ci/cloudbuild.yaml
@@ -8,16 +8,16 @@ steps:
     dir: ./images/releng/ci
     args:
       - build
-      - --tag=gcr.io/$PROJECT_ID/releng-ci:$_GIT_TAG
-      - --tag=gcr.io/$PROJECT_ID/releng-ci:$_IMAGE_VERSION
-      - --tag=gcr.io/$PROJECT_ID/releng-ci:latest
+      - --tag=$_REGISTRY/releng-ci:$_GIT_TAG
+      - --tag=$_REGISTRY/releng-ci:$_IMAGE_VERSION
+      - --tag=$_REGISTRY/releng-ci:latest
       - --build-arg=GO_VERSION=${_GO_VERSION}
       - .
   - name: gcr.io/gcp-runtimes/container-structure-test
     dir: ./images/releng/ci
     args:
       - test
-      - --image=gcr.io/$PROJECT_ID/releng-ci:latest
+      - --image=$_REGISTRY/releng-ci:latest
       - --config=test.yaml
 substitutions:
   # _GIT_TAG will be filled with a git-based tag for the image, of the form
@@ -26,6 +26,7 @@ substitutions:
   _PULL_BASE_REF: 'dev'
   _IMAGE_VERSION: 'v0.5.0'
   _GO_VERSION: '1.16.1'
+  _REGISTRY: 'fake.repository/registry-name'
 images:
   - 'gcr.io/$PROJECT_ID/releng-ci:${_GIT_TAG}'
   - 'gcr.io/$PROJECT_ID/releng-ci:${_IMAGE_VERSION}'
diff --git a/images/releng/k8s-ci-builder/cloudbuild.yaml b/images/releng/k8s-ci-builder/cloudbuild.yaml
index d6d19ed86f9..0d4ef36b709 100644
--- a/images/releng/k8s-ci-builder/cloudbuild.yaml
+++ b/images/releng/k8s-ci-builder/cloudbuild.yaml
@@ -16,7 +16,8 @@ steps:
     dir: ./images/releng/k8s-ci-builder
     env:
     - DOCKER_CLI_EXPERIMENTAL=enabled
-    - REGISTRY=gcr.io/$PROJECT_ID
+    - REGISTRY=$_REGISTRY
+    - IMAGE_ARG='$_REGISTRY/k8s-ci-builder:${_GIT_TAG}-${_CONFIG}'
     - HOME=/root
     - TAG=${_GIT_TAG}
     - PULL_BASE_REF=${_PULL_BASE_REF}
@@ -24,7 +25,6 @@ steps:
     - GO_VERSION=${_GO_VERSION}
     - BAZEL_VERSION=${_BAZEL_VERSION}
     - OLD_BAZEL_VERSION=${_OLD_BAZEL_VERSION}
-    - IMAGE_ARG='gcr.io/$PROJECT_ID/k8s-ci-builder:${_GIT_TAG}-${_CONFIG}'
     - SKOPEO_VERSION=${_SKOPEO_VERSION}
     args:
     - '-c'
@@ -42,6 +42,7 @@ substitutions:
   _BAZEL_VERSION: '0.0.0'
   _OLD_BAZEL_VERSION: '0.0.0'
   _SKOPEO_VERSION: 'v0.0.0'
+  _REGISTRY: 'fake.repository/registry-name'
 
 tags:
 - 'k8s-ci-builder'