diff --git a/libraries/textcomposer/impl/src/test/kotlin/io/element/android/libraries/textcomposer/impl/components/markdown/MarkdownTextInputTest.kt b/libraries/textcomposer/impl/src/test/kotlin/io/element/android/libraries/textcomposer/impl/components/markdown/MarkdownTextInputTest.kt
index 15687cb4c9..d08048241e 100644
--- a/libraries/textcomposer/impl/src/test/kotlin/io/element/android/libraries/textcomposer/impl/components/markdown/MarkdownTextInputTest.kt
+++ b/libraries/textcomposer/impl/src/test/kotlin/io/element/android/libraries/textcomposer/impl/components/markdown/MarkdownTextInputTest.kt
@@ -191,7 +191,7 @@ class MarkdownTextInputTest : RobolectricTest() {
         state: MarkdownTextEditorState = aMarkdownTextEditorState(),
         onTyping: (Boolean) -> Unit = {},
         onSuggestionReceived: (Suggestion?) -> Unit = {},
-        onSendMessage: (() -> Unit)? = null,
+        onSendMessage: (() -> Unit) = {},
     ) {
         setContent {
             val style = ElementRichTextEditorStyle.composerStyle(hasFocus = state.hasFocus)