diff --git a/.kokoro/samples/python3.6/common.cfg b/.kokoro/samples/python3.6/common.cfg
index 7c52aefa..9ac55bd8 100644
--- a/.kokoro/samples/python3.6/common.cfg
+++ b/.kokoro/samples/python3.6/common.cfg
@@ -24,6 +24,12 @@ env_vars: {
     value: "gcr.io/cloud-devrel-kokoro-resources/python-samples-testing-docker"
 }
 
+# Declare build specific Cloud project.
+env_vars: {
+    key: "BUILD_SPECIFIC_GCLOUD_PROJECT"
+    value: "python-docs-samples-tests-py36"
+}
+
 # Download secrets for samples
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 
diff --git a/.kokoro/samples/python3.7/common.cfg b/.kokoro/samples/python3.7/common.cfg
index 15dfa037..1f5ce5da 100644
--- a/.kokoro/samples/python3.7/common.cfg
+++ b/.kokoro/samples/python3.7/common.cfg
@@ -24,6 +24,12 @@ env_vars: {
     value: "gcr.io/cloud-devrel-kokoro-resources/python-samples-testing-docker"
 }
 
+# Declare build specific Cloud project.
+env_vars: {
+    key: "BUILD_SPECIFIC_GCLOUD_PROJECT"
+    value: "python-docs-samples-tests-py37"
+}
+
 # Download secrets for samples
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"
 
diff --git a/.kokoro/samples/python3.8/common.cfg b/.kokoro/samples/python3.8/common.cfg
index eddefb11..816c3b79 100644
--- a/.kokoro/samples/python3.8/common.cfg
+++ b/.kokoro/samples/python3.8/common.cfg
@@ -24,6 +24,12 @@ env_vars: {
     value: "gcr.io/cloud-devrel-kokoro-resources/python-samples-testing-docker"
 }
 
+# Declare build specific Cloud project.
+env_vars: {
+    key: "BUILD_SPECIFIC_GCLOUD_PROJECT"
+    value: "python-docs-samples-tests-py38"
+}
+
 # Download secrets for samples
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/python-docs-samples"