diff --git a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt
index dd4a819f..51b094f6 100644
--- a/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt
+++ b/modules/kobalt-plugin-api/src/main/kotlin/com/beust/kobalt/Variant.kt
@@ -74,7 +74,7 @@ class Variant(val initialProductFlavor: ProductFlavorConfig? = null,
             } else if (sourceSet == SourceSet.TEST){
                 project.sourceDirectoriesTest.map { File(it) }
             } else {
-                throw KobaltException("Unknown source set: $sourceSet))
+                throw KobaltException("Unknown source set: $sourceSet")
             }
         if (isDefault) {
             result.addAll(sourceDirectories)