diff --git a/runners/google-cloud-dataflow-java/build.gradle b/runners/google-cloud-dataflow-java/build.gradle
index 4ddbb6ea41f4..5d898bb57d86 100644
--- a/runners/google-cloud-dataflow-java/build.gradle
+++ b/runners/google-cloud-dataflow-java/build.gradle
@@ -149,7 +149,7 @@ def dataflowLegacyWorkerJar = project.findProperty('dataflowWorkerJar') ?: proje
 def dataflowKmsKey = project.findProperty('dataflowKmsKey') ?: "projects/apache-beam-testing/locations/global/keyRings/beam-it/cryptoKeys/test"
 def firestoreDb = project.findProperty('firestoreDb') ?: 'firestoredb'
 
-def dockerImageRoot = project.findProperty('dockerImageRoot') ?: "us.gcr.io/${gcpProject}/java-postcommit-it"
+def dockerImageRoot = project.findProperty('dockerImageRoot') ?: "us.gcr.io/${gcpProject.replaceAll(':', '/')}/java-postcommit-it"
 def dockerJavaImageContainer = "${dockerImageRoot}/java"
 def dockerPythonImageContainer = "${dockerImageRoot}/python"
 def dockerTag = new Date().format('yyyyMMddHHmmss')