diff --git a/Error-log b/Error-log
index 25e9f04..99ed904 100644
--- a/Error-log
+++ b/Error-log
@@ -28,3 +28,6 @@ I changed the meta-arg parser (C, Scheme, and doc) so that newline
 
 autoreap-policy's optional arg wasn't optional -- the dot was missing.
     Reported by rthappe@mathematik.uni-freiburg.DE (Rolf-Thomas Happe).
+
+alist->env didn't work, because it was passing a list, not a vector,
+    to the %INSTALL-ENV procedure. Reported by Mike Sperber 9/19/96.
diff --git a/scsh/syscalls.scm b/scsh/syscalls.scm
index 5f67135..5bb8c8f 100644
--- a/scsh/syscalls.scm
+++ b/scsh/syscalls.scm
@@ -90,8 +90,7 @@
 (define (%exec prog arg-list env)
   (let ((argv (mapv! stringify (list->vector arg-list)))
 	(prog (stringify prog))
-	(env (if (eq? env #t) #t
-		 (list->vector (alist->env-list env)))))
+	(env (if (eq? env #t) #t (alist->env-vec env))))
     (%%exec prog argv env)))
 
 
@@ -879,9 +878,10 @@
 			   cons))
        env-list))
 
-(define (alist->env-list alist)
-  (map (lambda (var.val) (string-append (car var.val) "=" (cdr var.val)))
-       alist))
+(define (alist->env-vec alist)
+  (list->vector (map (lambda (var.val)
+		       (string-append (car var.val) "=" (cdr var.val)))
+		     alist)))
 
 ;;; ENV->ALIST
 
@@ -904,7 +904,7 @@
 (define-errno-syscall (%install-env env-vec) %install-env/errno)
 
 (define (alist->env alist)
-  (%install-env (alist->env-list alist)))
+  (%install-env (alist->env-vec alist)))
 
 ;;; GETENV, PUTENV, SETENV