diff --git a/server/src/bin/lesavka_uvc/payload_limits.rs b/server/src/bin/lesavka_uvc/payload_limits.rs
index 66a7640..575ebdc 100644
--- a/server/src/bin/lesavka_uvc/payload_limits.rs
+++ b/server/src/bin/lesavka_uvc/payload_limits.rs
@@ -9,7 +9,9 @@ fn compute_payload_cap(bulk: bool) -> Option<PayloadCap> {
         });
     }
 
-    let mut pct = env_u32("LESAVKA_UVC_LIMIT_PCT", 95);
+    let Some(mut pct) = env_u32_opt("LESAVKA_UVC_LIMIT_PCT") else {
+        return None;
+    };
     if pct == 0 {
         pct = 1;
     } else if pct > 100 {