diff --git a/tests/printf/printf.sh b/tests/printf/printf.sh
index 834012cc5..0c0948c6c 100755
--- a/tests/printf/printf.sh
+++ b/tests/printf/printf.sh
@@ -64,6 +64,8 @@ $prog '6 \41\n' | tr '\41' '!' >> out
 # prints a NUL byte followed by the digit '2' and a 'y'.
 $prog '7 \2y \02y \002y \0002y\n' |tr '\0\2' '*=' >> out
 
+$prog '8 %#s %#s %#s %#s\n' '\1y' '\01y' '\001y' '\0001y'|tr '\1' = >> out
+# Deprecated %b equivalent
 $prog '8 %b %b %b %b\n' '\1y' '\01y' '\001y' '\0001y'|tr '\1' = >> out
 
 $prog '9 %*dx\n' -2 0 >>out || fail=1
@@ -90,6 +92,7 @@ cat <<\EOF > exp
 6 !
 7 =y =y =y *2y
 8 =y =y =y =y
+8 =y =y =y =y
 9 0 x
 10 0x
 11  x