diff --git a/javatests/google/registry/rde/BUILD b/javatests/google/registry/rde/BUILD
index 6249b616b..6a5e98d6d 100644
--- a/javatests/google/registry/rde/BUILD
+++ b/javatests/google/registry/rde/BUILD
@@ -51,10 +51,6 @@ 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"],
diff --git a/javatests/google/registry/testing/GpgSystemCommandRule.java b/javatests/google/registry/testing/GpgSystemCommandRule.java
index b68c03fea..b073a46b5 100644
--- a/javatests/google/registry/testing/GpgSystemCommandRule.java
+++ b/javatests/google/registry/testing/GpgSystemCommandRule.java
@@ -84,7 +84,9 @@ public final class GpgSystemCommandRule extends ExternalResource {
   @Override
   protected void before() throws IOException, InterruptedException {
     checkState(Objects.equals(cwd, DEV_NULL));
-    cwd = File.createTempFile(TEMP_FILE_PREFIX, "", null);
+    File tmpRoot = null;
+    tmpRoot = new File(System.getenv("TMPDIR"));
+    cwd = File.createTempFile(TEMP_FILE_PREFIX, "", tmpRoot);
     cwd.delete();
     cwd.mkdir();
     conf = new File(cwd, ".gnupg");