diff --git a/meta/recipes-extended/findutils/findutils/run-ptest b/meta/recipes-extended/findutils/findutils/run-ptest
index 0c9af47efd..afe004b01a 100644
--- a/meta/recipes-extended/findutils/findutils/run-ptest
+++ b/meta/recipes-extended/findutils/findutils/run-ptest
@@ -13,6 +13,9 @@ export built_programs="find xargs locate updatedb"
 # this gets substituted by sed during build
 export VERSION="__run_ptest_version__"
 
+# Force ASCII quotes so exp vs err comparisons are stable across locales.
+export LC_ALL=C
+
 for f in tests/*/*.sh; do
 	bash $f ;
 	case $? in