diff --git a/collects/compiler/decompile.ss b/collects/compiler/decompile.ss
index 819e86569b..8729a983b1 100644
--- a/collects/compiler/decompile.ss
+++ b/collects/compiler/decompile.ss
@@ -13,6 +13,7 @@
          (let ([ns (make-base-empty-namespace)])
            (parameterize ([current-namespace ns])
              (namespace-require ''#%kernel)
+             (namespace-require ''#%unsafe)
              (for/list ([l (namespace-mapped-symbols)])
                (cons l (with-handlers ([exn:fail? (lambda (x) #f)])
                          (compile l))))))]
@@ -320,7 +321,7 @@
                                       list list* vector vector-immutable box))]
              [(3) (memq (car a) '(eq? = <= < >= >
                                       bitwise-bit-set? char=?
-                                      + - * / min max bitwise-and bitwise-ior
+                                      + - * / quotient remainder min max bitwise-and bitwise-ior
                                       arithmetic-shift vector-ref string-ref bytes-ref
                                       set-mcar! set-mcdr! cons mcons
                                       list list* vector vector-immutable))]
diff --git a/collects/compiler/zo-parse.ss b/collects/compiler/zo-parse.ss
index 8af27954f9..397f585e31 100644
--- a/collects/compiler/zo-parse.ss
+++ b/collects/compiler/zo-parse.ss
@@ -113,9 +113,12 @@
      (make-compilation-top ld prefix code)]))
 
 (define (read-resolve-prefix v)
-  (match v
-    [`(,i ,tv . ,sv)
-     (make-prefix i (vector->list tv) (vector->list sv))]))
+  (let-values ([(v unsafe?) (if (integer? (car v))
+                                (values v #f)
+                                (values (cdr v) #t))])
+    (match v
+      [`(,i ,tv . ,sv)
+       (make-prefix i (vector->list tv) (vector->list sv))])))
 
 (define (read-unclosed-procedure v)
   (define CLOS_HAS_REST 1)