diff --git a/.github/workflows/ci-test.yml b/.github/workflows/ci-test.yml
index 53aa2fd..9766430 100644
--- a/.github/workflows/ci-test.yml
+++ b/.github/workflows/ci-test.yml
@@ -3,7 +3,7 @@ name: Test
 on: [push, pull_request]
 
 env:
-  JRUBY_OPTS: '-J-ea'
+  JRUBY_OPTS: '-J-ea -J-Djruby.ji.ambiguous.calls.debug=true'
 
 jobs: