diff --git a/addons/mail/static/src/components/composer_text_input/composer_text_input.scss b/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
index 066364847bc..1c018420af6 100644
--- a/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
+++ b/addons/mail/static/src/components/composer_text_input/composer_text_input.scss
@@ -17,6 +17,7 @@
 
 .o_ComposerTextInput_textareaStyle {
     padding: 10px; // carefully crafted to have the text in the middle in chat window
+    min-height: 40px;
     resize: none;
     border-radius: $o-mail-rounded-rectangle-border-radius-lg;
     border: none;