diff --git a/gcp-auth-extension/build.gradle.kts b/gcp-auth-extension/build.gradle.kts
index 0f8b121d9..f378df0d9 100644
--- a/gcp-auth-extension/build.gradle.kts
+++ b/gcp-auth-extension/build.gradle.kts
@@ -103,6 +103,9 @@ tasks.register<Copy>("copyAgent") {
 }
 
 tasks.register<Test>("IntegrationTestUserCreds") {
+  testClassesDirs = sourceSets.test.get().output.classesDirs
+  classpath = sourceSets.test.get().runtimeClasspath
+
   dependsOn(tasks.shadowJar)
   dependsOn(tasks.named("copyAgent"))