diff --git a/package.json b/package.json
index 6ac1544..c881daf 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,6 @@
   "author": "Sven Slootweg",
   "license": "WTFPL",
   "dependencies": {
-    "checkit": "^0.7.0",
     "deep-assign": "^2.0.0",
     "default-value": "^1.0.0",
     "dotty": "0.0.2"
diff --git a/src/create-composite-object.js b/src/create-composite-object.js
index b1cc411..5f097bc 100644
--- a/src/create-composite-object.js
+++ b/src/create-composite-object.js
@@ -5,6 +5,7 @@ const defaultValue = require("default-value");
 
 const createObject = require("./create-object");
 const createPropertyMapper = require("./property-mapper");
+const requireProperties = require("./require-properties");
 const max = require("./util/max");
 const min = require("./util/min");
 
@@ -16,6 +17,8 @@ function getPosition(object) {
 }
 
 module.exports = function createCompositeObject(options) {
+	requireProperties(options, ["drawOrder", "objects"]);
+
 	let mapProperties = createPropertyMapper(options.propertyMap);
 	let initialPropertySet = mapProperties(options);
 
diff --git a/src/index.js b/src/index.js
index 5aad1f8..8830816 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,7 @@
 'use strict';
 
 module.exports = {
-	validateSync: require("./validate-sync"),
+	requireProperties: require("./require-properties"),
 	createObject: require("./create-object"),
 	createCompositeObject: require("./create-composite-object")
 }
diff --git a/src/require-properties.js b/src/require-properties.js
new file mode 100644
index 0000000..d5f033d
--- /dev/null
+++ b/src/require-properties.js
@@ -0,0 +1,17 @@
+'use strict';
+
+module.exports = function requireProperties(object, properties) {
+	let missingProperties = [];
+
+	properties.forEach((property) => {
+		if (object[property] == null) {
+			missingProperties.push(property);
+		}
+	});
+
+	if (missingProperties.length > 0) {
+		throw new Error(`Missing required properties: ${missingProperties.join(", ")}`);
+	} else {
+		return true;
+	}
+};
diff --git a/src/validate-sync.js b/src/validate-sync.js
deleted file mode 100644
index a581e70..0000000
--- a/src/validate-sync.js
+++ /dev/null
@@ -1,13 +0,0 @@
-'use strict';
-
-const checkit = require("checkit");
-
-module.exports = function(object, rules) {
-	let [error, validated] = checkit(rules).runSync(object);
-
-	if (error != null) {
-		throw error;
-	} else {
-		return validated;
-	}
-};