diff --git a/src/runtime.rs b/src/runtime.rs
index 9c94c78..dac69f4 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -1,5 +1,10 @@
 use core::panic;
-use std::{cmp::Ordering, i16, io::Write, u16, u32, u8, usize};
+use std::{
+    cmp::Ordering,
+    i16,
+    io::{stdout, Write},
+    u16, u32, u8, usize,
+};
 
 use crate::Air;
 use colored::Colorize;
@@ -273,6 +278,7 @@ impl RunState {
             0x21 => {
                 let chr = (*self.reg(0) & 0xFF) as u8 as char;
                 print!("{chr}");
+                stdout().flush().unwrap();
             }
             // puts
             0x22 => {
@@ -289,6 +295,7 @@ impl RunState {
                     addr += 1;
                 }
                 print!("{string}");
+                stdout().flush().unwrap();
             }
             // in
             0x23 => {