diff --git a/tests/misc/sleep.sh b/tests/misc/sleep.sh
index c20ce01..141067f 100755
--- a/tests/misc/sleep.sh
+++ b/tests/misc/sleep.sh
@@ -39,4 +39,13 @@ returns_ 124 timeout 0.1 sleep 1d 2h 3m 4s || fail=1
 returns_ 124 timeout 0.1 sleep inf || fail=1
 returns_ 124 timeout 0.1 sleep $LDBL_MAX || fail=1
 
+# Test locale decimal handling for printf, sleep, timeout
+f=$LOCALE_FR_UTF8
+: ${LOCALE_FR_UTF8=none}
+if test "$LOCALE_FR_UTF8" != "none"; then
+  locale_decimal=$(LC_ALL=$f env printf '%0.3f' 0.001) || fail=1
+  locale_decimal=$(LC_ALL=$f env printf '%0.3f' "$locale_decimal") || fail=1
+  LC_ALL=$f timeout 1$locale_decimal sleep "$locale_decimal" || fail=1
+fi
+
 Exit $fail