diff --git a/testsuite/ls/ls-l-works b/testsuite/ls/ls-l-works
index e80f9582e..efc2b196e 100644
--- a/testsuite/ls/ls-l-works
+++ b/testsuite/ls/ls-l-works
@@ -1,4 +1,4 @@
 [ -n "$d" ] || d=..
-LANG=C ls -l "$d" > logfile.gnu
+LC_ALL=C ls -l "$d" > logfile.gnu
 busybox ls -l "$d" > logfile.bb
 diff -w logfile.gnu logfile.bb
diff --git a/testsuite/ls/ls-s-works b/testsuite/ls/ls-s-works
index cdd9878c0..6c8bf3627 100644
--- a/testsuite/ls/ls-s-works
+++ b/testsuite/ls/ls-s-works
@@ -1,4 +1,4 @@
 [ -n "$d" ] || d=..
-LANG=C ls -1s "$d" > logfile.gnu
+LC_ALL=C ls -1s "$d" > logfile.gnu
 busybox ls -1s "$d" > logfile.bb
 cmp logfile.gnu logfile.bb