diff --git a/lib/pages/chat/input_bar.dart b/lib/pages/chat/input_bar.dart
index 35578a6fe..26a8d7e30 100644
--- a/lib/pages/chat/input_bar.dart
+++ b/lib/pages/chat/input_bar.dart
@@ -474,6 +474,9 @@ class InputBar extends StatelessWidget {
             keyboardType: keyboardType!,
             textInputAction: textInputAction,
             autofocus: autofocus!,
+            inputFormatters: [
+              LengthLimitingTextInputFormatter((maxPDUSize / 3).floor()),
+            ],
             onSubmitted: (text) {
               // fix for library for now
               // it sets the types for the callback incorrectly