diff --git a/src/dodo.schema b/src/dodo.schema
index f0136ab..54cd568 100644
--- a/src/dodo.schema
+++ b/src/dodo.schema
@@ -3,8 +3,12 @@ CREATE TABLE tasks(
 	title TEXT NOT NULL,
 	active_id INTEGER UNIQUE,
 	status TEXT NOT NULL DEFAULT 'backlog',
-	due_date DATE,
-	creation_date DATE DEFAULT (date('now'))
+	creation_date DATE DEFAULT (date('now')),
+	due_date TEXT,
+	    CHECK (
+	        due_date IS NULL OR 
+	        due_date GLOB '????-??-??'
+		)
 );
 
 CREATE TABLE entries(