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diff --git a/src/compiler/ltn.lisp b/src/compiler/ltn.lisp
index 7d12edb..619ebbc 100644
--- a/src/compiler/ltn.lisp
+++ b/src/compiler/ltn.lisp
@@ -67,13 +67,24 @@
 ;;; Return true if a constant LEAF is of a type which we can legally
 ;;; directly reference in code. Named constants with arbitrary pointer
 ;;; values cannot, since we must preserve EQLness.
+;;;
+;;; FIXME: why not?  The values in a function's constant vector are
+;;; subject to being moved by the garbage collector.  Having arbitrary
+;;; values in said vector doesn't seem like a problem.
 (defun legal-immediate-constant-p (leaf)
   (declare (type constant leaf))
   (or (not (leaf-has-source-name-p leaf))
-      (typecase (constant-value leaf)
-	((or number character) t)
-	(symbol (symbol-package (constant-value leaf)))
-	(t nil))))
+      ;; Specialized arrays are legal, too.  KLUDGE: this would be
+      ;; *much* cleaner if SIMPLE-UNBOXED-ARRAY was defined on the host.
+      #.(loop for saetp across sb!vm:*specialized-array-element-type-properties*
+              unless (eq t (sb!vm:saetp-specifier saetp))
+              collect `((simple-array ,(sb!vm:saetp-specifier saetp) (*)) t) into cases
+              finally (return
+                        `(typecase (constant-value leaf)
+                           ((or number character) t)
+                           (symbol (symbol-package (constant-value leaf)))
+                           ,@cases
+                           (t nil))))))
 
 ;;; If LVAR is used only by a REF to a leaf that can be delayed, then
 ;;; return the leaf, otherwise return NIL.