diff --git a/src/functionalTest/kotlin/io/github/sgtsilvio/gradle/oci/TestProject.kt b/src/functionalTest/kotlin/io/github/sgtsilvio/gradle/oci/TestProject.kt
index 51a6cc64..93479bbc 100644
--- a/src/functionalTest/kotlin/io/github/sgtsilvio/gradle/oci/TestProject.kt
+++ b/src/functionalTest/kotlin/io/github/sgtsilvio/gradle/oci/TestProject.kt
@@ -67,7 +67,7 @@ internal class TestProject(projectDir: File) {
                 imageDependencies.forTest(tasks.test) {
                     add(project)
                     add(project).tag("latest")
-                    constraint("library:eclipse-temurin:20.0.1_9-jre-jammy")
+                    add(constraint("library:eclipse-temurin:20.0.1_9-jre-jammy"))
                     add("hivemq:hivemq4:4.16.0")
                 }
             }