diff --git a/api/src/main/groovy/com/jessebrault/ssg/buildscript/OutputDir.groovy b/api/src/main/groovy/com/jessebrault/ssg/buildscript/OutputDir.groovy
index f094e77..40a7917 100644
--- a/api/src/main/groovy/com/jessebrault/ssg/buildscript/OutputDir.groovy
+++ b/api/src/main/groovy/com/jessebrault/ssg/buildscript/OutputDir.groovy
@@ -7,7 +7,7 @@ import groovy.transform.NullCheck
 @EqualsAndHashCode
 final class OutputDir {
 
-    final String path
+    private final String path
 
     OutputDir(String path) {
         this.path = path
diff --git a/api/src/test/groovy/com/jessebrault/ssg/buildscript/BuildScriptBaseTests.groovy b/api/src/test/groovy/com/jessebrault/ssg/buildscript/BuildScriptBaseTests.groovy
index d3bbf6b..b5cd630 100644
--- a/api/src/test/groovy/com/jessebrault/ssg/buildscript/BuildScriptBaseTests.groovy
+++ b/api/src/test/groovy/com/jessebrault/ssg/buildscript/BuildScriptBaseTests.groovy
@@ -75,7 +75,7 @@ final class BuildScriptBaseTests {
         }
         assertEquals(1, r.size())
         def b0 = r[0]
-        assertEquals(f, b0.outputDirFunction.apply(b0).asFile())
+        assertEquals(f, b0.outputDirFunction.apply(b0) as File)
     }
 
     @Test
@@ -87,7 +87,7 @@ final class BuildScriptBaseTests {
         }
         assertEquals(1, r.size())
         def b0 = r[0]
-        assertEquals('test', b0.outputDirFunction.apply(b0).path)
+        assertEquals('test', b0.outputDirFunction.apply(b0) as String)
     }
 
     @Test