diff --git a/test/integration/clusterio.js b/test/integration/clusterio.js
index 3bd00e3b..38710887 100644
--- a/test/integration/clusterio.js
+++ b/test/integration/clusterio.js
@@ -88,39 +88,39 @@ describe("Integration of Clusterio", function() {
 		});
 
 		describe("create-save", function() {
-			slowTest(this);
 			it("creates a save", async function() {
+				slowTest(this);
 				await clusterctl._commands.get("create-save").run({instance: "test"}, testControl);
 			});
 		});
 
 		describe("start-instance", function() {
-			slowTest(this);
 			it("starts the instance", async function() {
+				slowTest(this);
 				await clusterctl._commands.get("start-instance").run({instance: "test"}, testControl);
 				// TODO check that the instance actually stopped
 			});
 		});
 
 		describe("send-rcon", function() {
-			slowTest(this);
 			it("sends the command", async function() {
+				slowTest(this);
 				await clusterctl._commands.get("send-rcon").run({instance: "test", command: "test"}, testControl);
 				// TODO check that the command was received
 			});
 		});
 
 		describe("stop-instance", function() {
-			slowTest(this);
 			it("stops the instance", async function() {
+				slowTest(this);
 				await clusterctl._commands.get("stop-instance").run({instance: "test"}, testControl);
 				// TODO check that the instance actually stopped
 			});
 		});
 
 		describe("delete-instance", function() {
-			slowTest(this);
 			it("deletes the instance", async function() {
+				slowTest(this);
 				await clusterctl._commands.get("delete-instance").run({instance: "test"}, testControl);
 				assert(!await fs.exists(path.join(instancesDir, "test")), "Instance was not deleted");
 			});
diff --git a/test/integration/patch.js b/test/integration/patch.js
index 87edc342..25e8b1f8 100644
--- a/test/integration/patch.js
+++ b/test/integration/patch.js
@@ -10,9 +10,17 @@ const factorio = require("lib/factorio");
 require("./server")
 
 describe("Integration of lib/factorio/patch", function() {
+	// Mark that this test depeneds on a test that takes a lot of time.
+	function slowTest(test) {
+		if (process.env.FAST_TEST) {
+			test.skip();
+		}
+	}
+
 	describe("patch()", function() {
 		let savePath = path.join("test", "temp", "integration", "saves", "test.zip");
 		it("should patch a freeplay game", async function() {
+			slowTest(this);
 			await factorio.patch(savePath, [{
 				name: "test",
 				files: [{ path: "test.lua", content: "-- test" }]
@@ -23,6 +31,7 @@ describe("Integration of lib/factorio/patch", function() {
 			assert.equal(content, "-- test");
 		});
 		it("should remove old modules in a save", async function() {
+			slowTest(this);
 			await factorio.patch(savePath, [{ name: "test", files: [] }]);
 			let zip = await jszip.loadAsync(await fs.readFile(savePath));
 			assert.equal(zip.file("test/modules/test.lua"), null);