diff --git a/extlib/benz b/extlib/benz
index 15889a5f..569b1ace 160000
--- a/extlib/benz
+++ b/extlib/benz
@@ -1 +1 @@
-Subproject commit 15889a5feb515bd67ee7dc2c6419d16703151a54
+Subproject commit 569b1ace02e6a066b21f94dff23c4e01b8748bf0
diff --git a/t/r7rs-tests.scm b/t/r7rs-tests.scm
index 8f315463..e1d82f48 100644
--- a/t/r7rs-tests.scm
+++ b/t/r7rs-tests.scm
@@ -919,6 +919,16 @@
 (test 1 (exact 1.0))
 (test #t (exact? (exact 1.0)))
 
+(test "10" (number->string 10))
+(test "10" (number->string 10 10))
+(test "10" (number->string 2 2))
+(test "10" (number->string 8 8))
+(test "10" (number->string 16 16))
+
+(test "2.3" (number->string 2.3))
+(test "2.3" (number->string 2.30))
+(test "2.301" (number->string 2.301))
+
 (test 100 (string->number "100"))
 (test 256 (string->number "100" 16))
 (test 100.0 (string->number "1e2"))