diff --git a/collects/rnrs/arithmetic/flonums-6.ss b/collects/rnrs/arithmetic/flonums-6.ss
index 4dc088ad36..4d5ca26dfc 100644
--- a/collects/rnrs/arithmetic/flonums-6.ss
+++ b/collects/rnrs/arithmetic/flonums-6.ss
@@ -49,56 +49,24 @@
 
 (define-fl abs flabs (a) nocheck)
 
-(provide fldiv flmod fldiv-and-mod
-         fldiv0 flmod0 fldiv0-and-mod0)
-(define (fldiv a b)
-  (unless (inexact-real? a)
-    (raise-type-error 'fldiv "flonum" a))
-  (unless (inexact-real? b)
-    (raise-type-error 'fldiv "flonum" b))
-  (if (zero? b)
-      +nan.0
-      (div a b)))
-(define (flmod a b)
-  (unless (inexact-real? a)
-    (raise-type-error 'flmod "flonum" a))
-  (unless (inexact-real? b)
-    (raise-type-error 'flmod "flonum" b))
-  (if (zero? b)
-      +nan.0
-      (mod a b)))
+(provide fldiv-and-mod
+         fldiv0-and-mod0)
 (define (fldiv-and-mod a b)
   (unless (inexact-real? a)
     (raise-type-error 'fldiv-and-mod "flonum" a))
   (unless (inexact-real? b)
     (raise-type-error 'fldiv-and-mod "flonum" b))
-  (if (zero? b)
-      (values +nan.0 +nan.0)
-      (div-and-mod a b)))
+  (div-and-mod a b))
+(define-fl div fldiv (a b) nocheck)
+(define-fl mod flmod (a b) nocheck)
 (define (fldiv0-and-mod0 a b)
   (unless (inexact-real? a)
     (raise-type-error 'fldiv0-and-mod0 "flonum" a))
   (unless (inexact-real? b)
     (raise-type-error 'fldiv0-and-mod0 "flonum" b))
-  (if (zero? b)
-      (values +nan.0 +nan.0)
-      (div0-and-mod0 a b)))
-(define (fldiv0 a b)
-  (unless (inexact-real? a)
-    (raise-type-error 'fldiv0 "flonum" a))
-  (unless (inexact-real? b)
-    (raise-type-error 'fldiv0 "flonum" b))
-  (if (zero? b)
-      +nan.0
-      (div0 a b)))
-(define (flmod0 a b)
-  (unless (inexact-real? a)
-    (raise-type-error 'flmod0 "flonum" a))
-  (unless (inexact-real? b)
-    (raise-type-error 'flmod0 "flonum" b))
-  (if (zero? b)
-      +nan.0
-      (mod0 a b)))
+  (div0-and-mod0 a b))
+(define-fl div0 fldiv0 (a b) nocheck)
+(define-fl mod0 flmod0 (a b) nocheck)
 
 (define (flnumerator c)
   (if (inexact-real? c)