diff --git a/src/anyref.rs b/src/anyref.rs
index 47d8502a..7edff7db 100644
--- a/src/anyref.rs
+++ b/src/anyref.rs
@@ -39,7 +39,7 @@ impl Slab {
                     internal_error("table grow failure")
                 }
                 if self.base == 0 {
-                    self.base = r as usize + (super::JSIDX_RESERVED as usize);
+                    self.base = r as usize;
                 } else if self.base + self.data.len() != r as usize {
                     internal_error("someone else allocated table entires?")
                 }