diff --git a/buildSrc/src/main/kotlin/pklJavaLibrary.gradle.kts b/buildSrc/src/main/kotlin/pklJavaLibrary.gradle.kts
index 6ebfb1dc6..4db4c2200 100644
--- a/buildSrc/src/main/kotlin/pklJavaLibrary.gradle.kts
+++ b/buildSrc/src/main/kotlin/pklJavaLibrary.gradle.kts
@@ -24,6 +24,10 @@ java {
   }
 }
 
+tasks.withType<JavaExec>().configureEach {
+  javaLauncher.set(javaToolchains.launcherFor(java.toolchain))
+}
+
 artifacts {
   // make sources Jar available to other subprojects
   add("sourcesJar", tasks["sourcesJar"])