diff --git a/octave/AVM.m b/octave/AVM.m
index a5df1df7..db827297 100644
--- a/octave/AVM.m
+++ b/octave/AVM.m
@@ -62,7 +62,7 @@ classdef AVM
 
         function s = init_state(n_locals)
             if nargin < 1; n_locals = 0; end
-            s.pc = int32(0);
+            s.pc = int32(1);  % 1-indexed for Octave
             s.stack = {};
             s.locals = cell(n_locals, 1);
             s.halted = false;