diff --git a/javatests/google/registry/rde/BUILD b/javatests/google/registry/rde/BUILD
index a5b8c19ae..bf4bb4319 100644
--- a/javatests/google/registry/rde/BUILD
+++ b/javatests/google/registry/rde/BUILD
@@ -50,6 +50,10 @@ java_library(
 GenTestRules(
     name = "GeneratedTestRules",
     default_test_size = "large",
+    # TODO (b/63619837): stop using hardcoded /tmp once
+    # https://github.com/bazelbuild/bazel/issues/3215 is resolved.
+    # If /tmp is not accessible, try changing it to one that is.
+    jvm_flags = ["-Djava.io.tmpdir=/tmp"],
     test_files = glob(
         ["*Test.java"],
         exclude = ["RdeUploadActionTest.java"],