diff --git a/src/intcode.rs b/src/intcode.rs
index 7befcc2..0138e5f 100644
--- a/src/intcode.rs
+++ b/src/intcode.rs
@@ -272,9 +272,8 @@ impl Computer {
             Mode::Immediate => want,
             Mode::Relative => (self.rel + self.get_pos(want)) as usize,
         };
-        if length < want {
-            let missing = (want - length) + 10000;
-            self.program.extend_from_slice(&vec![0; missing])
+        if length <= want {
+            self.program.resize(want + 1, 0);
         }
         self.program[want] = value;
     }