diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0264def0..6ece0937 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@
 - Fixed host hanging if stopped while an instance is in the process of creating a save during startup.
 - Fixed `instance.auto_start` option.
 - Fixed host log spammed with errors when plugins broadcast messages to instances with the plugin disabled.
+- Fixed properties of object config fields not being possible to remove.
 
 
 ## Version 2.0.0-alpha.14
diff --git a/packages/lib/src/config/classes.ts b/packages/lib/src/config/classes.ts
index 3e26b2c8..dae4fc8a 100644
--- a/packages/lib/src/config/classes.ts
+++ b/packages/lib/src/config/classes.ts
@@ -459,7 +459,7 @@ export class Config<
 	setProp<Field extends keyof Fields & string>(
 		name: Field,
 		prop: string,
-		value: unknown,
+		value?: unknown,
 		location = this.location,
 	) {
 		let def = this.constructor.fieldDefinitions[name];
diff --git a/packages/lib/src/data/messages_instance.ts b/packages/lib/src/data/messages_instance.ts
index ff29d886..f71b2a13 100644
--- a/packages/lib/src/data/messages_instance.ts
+++ b/packages/lib/src/data/messages_instance.ts
@@ -208,7 +208,7 @@ export class InstanceConfigSetPropRequest {
 		"instanceId": Type.Integer(),
 		"field": Type.String(),
 		"prop": Type.String(),
-		"value": Type.Unknown(),
+		"value": Type.Optional(Type.Unknown()),
 	});
 
 	static fromJSON(json: Static<typeof this.jsonSchema>) {
diff --git a/test/integration/clusterio.js b/test/integration/clusterio.js
index d34b8a0d..4fe1f626 100644
--- a/test/integration/clusterio.js
+++ b/test/integration/clusterio.js
@@ -557,6 +557,15 @@ describe("Integration of Clusterio", function() {
 				slowTest(this);
 				await checkInstanceStatus(44, "running");
 			});
+			it("should allow creating and removing props", async function() {
+				slowTest(this);
+				await execCtl("instance config set-prop test factorio.settings new_property new-string-value");
+				let config = await getControl().send(new lib.InstanceConfigGetRequest(44));
+				assert.equal(config["factorio.settings"]["new_property"], "new-string-value");
+				await execCtl("instance config set-prop test factorio.settings new_property");
+				config = await getControl().send(new lib.InstanceConfigGetRequest(44));
+				assert.equal(config["factorio.settings"]["new_property"], undefined);
+			});
 		});
 
 		describe("user set-admin/whitelisted/banned", function() {