diff --git a/.gitignore b/.gitignore
index aca7529..1708ed2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ run
 .gradle
 generated-src
 *.hprof
+testkit
diff --git a/build.gradle.kts b/build.gradle.kts
index b01fa45..7e9f0a4 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -173,6 +173,7 @@ tasks {
     withType<Test> {
         useJUnitPlatform()
 
+        systemProperty("projectDir", projectDir)
         systemProperty("buildDir", layout.buildDirectory.get().asFile)
     }
 
diff --git a/src/test/java/org/cthing/gradle/plugins/versioning/PluginIntegTest.java b/src/test/java/org/cthing/gradle/plugins/versioning/PluginIntegTest.java
index 4b52651..f6c26f5 100644
--- a/src/test/java/org/cthing/gradle/plugins/versioning/PluginIntegTest.java
+++ b/src/test/java/org/cthing/gradle/plugins/versioning/PluginIntegTest.java
@@ -29,12 +29,12 @@
 
 public class PluginIntegTest {
     private static final Path BASE_DIR = Path.of(System.getProperty("buildDir"), "integTest");
-    private static final Path WORKING_DIR;
+    private static final Path WORKING_DIR = Path.of(System.getProperty("projectDir"), "testkit");
 
     static {
         try {
             Files.createDirectories(BASE_DIR);
-            WORKING_DIR = Files.createTempDirectory(BASE_DIR, "working");
+            Files.createDirectories(WORKING_DIR);
         } catch (final IOException ex) {
             throw new RuntimeException(ex);
         }