diff --git a/src/frame.rs b/src/frame.rs
index c7a69b1..889c0c6 100644
--- a/src/frame.rs
+++ b/src/frame.rs
@@ -14,7 +14,7 @@ impl Frame {
         }
         Frame {
             stack: Stack::new(),
-            locals: vec![0; num_locals+1],
+            locals: vec![0; num_locals],
         }
     }