diff --git a/scheme/ikarus.boot.8.prebuilt b/scheme/ikarus.boot.8.prebuilt
index 0528a28..b092fed 100644
Binary files a/scheme/ikarus.boot.8.prebuilt and b/scheme/ikarus.boot.8.prebuilt differ
diff --git a/scheme/last-revision b/scheme/last-revision
index eb804fd..1902bae 100644
--- a/scheme/last-revision
+++ b/scheme/last-revision
@@ -1 +1 @@
-1864
+1865
diff --git a/scheme/pass-specify-rep-primops.ss b/scheme/pass-specify-rep-primops.ss
index 1b81245..241fd1c 100644
--- a/scheme/pass-specify-rep-primops.ss
+++ b/scheme/pass-specify-rep-primops.ss
@@ -1226,7 +1226,7 @@
   [(V x) 
    (prm 'sll 
      (prm 'srl 
-       (prm 'mref (T x)
+       (prm 'mref32 (T x)
           (K (- (+ disp-flonum-data 4) vector-tag)))
        (K 20))
      (K fx-shift))])