diff --git a/octave/AVM.m b/octave/AVM.m
index db827297..9dc360b3 100644
--- a/octave/AVM.m
+++ b/octave/AVM.m
@@ -39,8 +39,7 @@ classdef AVM
 
         function r = floor_div(a, b)
             if b == 0; error('division by zero'); end
-            q = idivide(a, b, 'floor');
-            r = int32(q);
+            r = int32(floor(double(a) / double(b)));
         end
 
         function r = lt_q16_v6(a, b)