diff --git a/test/mri/excludes/Test_StringCStr.rb b/test/mri/excludes/Test_StringCStr.rb
index 1eda299ef29..f2517b9a0a7 100644
--- a/test/mri/excludes/Test_StringCStr.rb
+++ b/test/mri/excludes/Test_StringCStr.rb
@@ -7,3 +7,4 @@
 exclude :test_wchar_embed, "<0> expected but was <30720>."
 exclude :test_wchar_long, "UTF-16BE."
 exclude :test_wchar_sub!, 'the given string is not compatible to the expected encoding "UTF_16BE", did you forget to convert it? (java.lang.IllegalArgumentException)'
+exclude :test_shared, "retain-on-retag(on CI): FAILED (pid 31660 exit 99)"