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 2469dbb1..e2ff55ca 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
@@ -68,14 +68,12 @@ class Variant(val initialProductFlavor: ProductFlavorConfig? = null,
     private fun sourceDirectories(project: Project, suffix: String, variantFirst: Boolean, sourceSet: SourceSet)
             : List<File> {
         val result = arrayListOf<File>()
-        val sourceDirectories =
-            if (sourceSet == SourceSet.MAIN) {
-                project.sourceDirectories.map { File(it) }.filter { it.exists() }
-            } else if (sourceSet == SourceSet.TEST){
-                project.sourceDirectoriesTest.map { File(it) }.filter { it.exists() }
-            } else {
-                throw KobaltException("Unknown source set: $sourceSet")
-            }
+        val sourceDirectories = (if (sourceSet == SourceSet.MAIN) project.sourceDirectories
+            else if (sourceSet == SourceSet.TEST) project.sourceDirectoriesTest
+            else throw KobaltException("Unknown source set: $sourceSet"))
+                .filter { File(project.directory, it).exists() }
+                .map { File(it) }
+
         if (isDefault) {
             result.addAll(sourceDirectories)
         } else {