diff --git a/src/tls_front/emulator.rs b/src/tls_front/emulator.rs
index a23373d..ba8453a 100644
--- a/src/tls_front/emulator.rs
+++ b/src/tls_front/emulator.rs
@@ -18,6 +18,9 @@ fn jitter_and_clamp_sizes(sizes: &[usize], rng: &SecureRandom) -> Vec<usize> {
         .iter()
         .map(|&size| {
             let base = size.clamp(MIN_APP_DATA, MAX_APP_DATA);
+            if base == MIN_APP_DATA || base == MAX_APP_DATA {
+                return base;
+            }
             let jitter_range = ((base as f64) * 0.03).round() as i64;
             if jitter_range == 0 {
                 return base;