diff --git a/release_notes.md b/release_notes.md
index 3798d8447e..35ee86be6f 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -1,5 +1,9 @@
 ## next (unreleased)
 
+## v6.2.2
+
+- [#566](https://github.com/TestArmada/flank/pull/566) Fix `--test` & `--xctestrun-file` on iOS CLI. ([bootstraponline](https://github.com/bootstraponline))
+
 ## v6.2.1
 
 - [#563](https://github.com/TestArmada/flank/pull/563) Fix CLI support for iOS. ([bootstraponline](https://github.com/bootstraponline))
diff --git a/test_runner/src/main/kotlin/ftl/args/IosArgs.kt b/test_runner/src/main/kotlin/ftl/args/IosArgs.kt
index b4f86c62df..977343c707 100644
--- a/test_runner/src/main/kotlin/ftl/args/IosArgs.kt
+++ b/test_runner/src/main/kotlin/ftl/args/IosArgs.kt
@@ -20,6 +20,7 @@ import ftl.config.FtlConstants
 import ftl.ios.IosCatalog
 import ftl.ios.Xctestrun
 import ftl.util.Utils
+import ftl.util.Utils.fatalError
 import java.nio.file.Files
 import java.nio.file.Path
 
@@ -42,8 +43,8 @@ class IosArgs(
     override val flakyTestAttempts = cli?.flakyTestAttempts ?: gcloud.flakyTestAttempts
 
     private val iosGcloud = iosGcloudYml.gcloud
-    var xctestrunZip = cli?.test ?: iosGcloud.test
-    var xctestrunFile = cli?.xctestrunFile ?: iosGcloud.xctestrunFile
+    var xctestrunZip = cli?.test ?: iosGcloud.test ?: fatalError("test is not set")
+    var xctestrunFile = cli?.xctestrunFile ?: iosGcloud.xctestrunFile ?: fatalError("xctestrun-file is not set")
     val xcodeVersion = cli?.xcodeVersion ?: iosGcloud.xcodeVersion
     val devices = cli?.device ?: iosGcloud.device
 
diff --git a/test_runner/src/main/kotlin/ftl/args/yml/IosGcloudYml.kt b/test_runner/src/main/kotlin/ftl/args/yml/IosGcloudYml.kt
index de187ceefc..323c34c05a 100644
--- a/test_runner/src/main/kotlin/ftl/args/yml/IosGcloudYml.kt
+++ b/test_runner/src/main/kotlin/ftl/args/yml/IosGcloudYml.kt
@@ -5,7 +5,6 @@ import com.fasterxml.jackson.annotation.JsonProperty
 import ftl.config.Device
 import ftl.config.FtlConstants.defaultIosModel
 import ftl.config.FtlConstants.defaultIosVersion
-import ftl.util.Utils.assertNotEmpty
 
 /**
  * iOS specific gcloud parameters
@@ -15,10 +14,10 @@ import ftl.util.Utils.assertNotEmpty
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 class IosGcloudYmlParams(
-    val test: String = "",
+    val test: String? = null,
 
     @field:JsonProperty("xctestrun-file")
-    val xctestrunFile: String = "",
+    val xctestrunFile: String? = null,
 
     @field:JsonProperty("xcode-version")
     val xcodeVersion: String? = null,
@@ -28,11 +27,6 @@ class IosGcloudYmlParams(
     companion object : IYmlKeys {
         override val keys = listOf("test", "xctestrun-file", "xcode-version", "device")
     }
-
-    init {
-        assertNotEmpty(test, "test is not set")
-        assertNotEmpty(xctestrunFile, "xctestrun-file is not set")
-    }
 }
 
 @JsonIgnoreProperties(ignoreUnknown = true)
diff --git a/test_runner/src/main/kotlin/ftl/util/Utils.kt b/test_runner/src/main/kotlin/ftl/util/Utils.kt
index eddf20c556..a1d702806b 100644
--- a/test_runner/src/main/kotlin/ftl/util/Utils.kt
+++ b/test_runner/src/main/kotlin/ftl/util/Utils.kt
@@ -45,7 +45,7 @@ object Utils {
     }
 
     @Suppress("NOTHING_TO_INLINE")
-    inline fun fatalError(e: String) {
+    inline fun fatalError(e: String): String {
         if (FtlConstants.useMock) {
             throw RuntimeException(e)
         }