diff --git a/src/boot/boot.janet b/src/boot/boot.janet
index b0c283a6..be477e99 100644
--- a/src/boot/boot.janet
+++ b/src/boot/boot.janet
@@ -2131,7 +2131,10 @@
         :prefix prefix
         :export ep} (table ;args))
   (def newenv (require path ;args))
-  (def prefix (or (and as (string as "/")) prefix (string path "/")))
+  (def prefix (or
+                (and as (string as "/"))
+                prefix
+                (string (last (string/split "/" path)) "/")))
   (loop [[k v] :pairs newenv :when (symbol? k) :when (not (v :private))]
     (def newv (table/setproto @{:private (not ep)} v))
     (put env (symbol prefix k) newv)))