diff --git a/src/config.rs b/src/config.rs
index ab54d09..cf737c2 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -29,7 +29,13 @@ pub struct UtcOffset {
 #[serde(tag = "type")]
 pub enum CustomFieldType {
     Text,
-    Textarea { rows: u8 },
+    Textarea {
+        #[serde(default = "default_textarea_rows")]
+        rows: u8,
+    },
+}
+const fn default_textarea_rows() -> u8 {
+    5
 }
 
 #[derive(Deserialize)]