diff --git a/shared/src/main/java/com/google/samples/apps/iosched/shared/di/IOSchedViewModelFactory.kt b/shared/src/main/java/com/google/samples/apps/iosched/shared/di/IOSchedViewModelFactory.kt
index 1699818c6a..07fa0a19f1 100644
--- a/shared/src/main/java/com/google/samples/apps/iosched/shared/di/IOSchedViewModelFactory.kt
+++ b/shared/src/main/java/com/google/samples/apps/iosched/shared/di/IOSchedViewModelFactory.kt
@@ -28,10 +28,10 @@ class IOSchedViewModelFactory @Inject constructor(
     private val creators: @JvmSuppressWildcards Map<Class<out ViewModel>, Provider<ViewModel>>
 ) : ViewModelProvider.Factory {
 
-    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+   override fun <T : ViewModel> create(modelClass: Class<T>): T {
         val found = creators.entries.find { modelClass.isAssignableFrom(it.key) }
         val creator = found?.value
-            ?: throw IllegalArgumentException("unknown model class " + modelClass)
+            ?: throw IllegalArgumentException("unknown model class $modelClass")
         try {
             @Suppress("UNCHECKED_CAST")
             return creator.get() as T