diff --git a/libio/Makefile b/libio/Makefile
index b03e4895f7..754db575a6 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -87,6 +87,7 @@ tst-fopenloc-ENV = LOCPATH=$(common-objpfx)localedata \
 tst-fgetws-ENV = LOCPATH=$(common-objpfx)localedata
 tst-ungetwc1-ENV = LOCPATH=$(common-objpfx)localedata
 tst-ungetwc2-ENV = LOCPATH=$(common-objpfx)localedata
+bug-ungetwc2-ENV = LOCPATH=$(common-objpfx)localedata
 tst-swscanf-ENV = LOCPATH=$(common-objpfx)localedata
 
 generated = tst-fopenloc.mtrace tst-fopenloc.check