diff --git a/buildSrc/src/main/kotlin/twomartens.java-preview.gradle.kts b/buildSrc/src/main/kotlin/twomartens.java-preview.gradle.kts
index 55b0390..b44645d 100644
--- a/buildSrc/src/main/kotlin/twomartens.java-preview.gradle.kts
+++ b/buildSrc/src/main/kotlin/twomartens.java-preview.gradle.kts
@@ -7,9 +7,9 @@ tasks.withType<JavaCompile>().configureEach {
 }
 
 tasks.withType<Test>().configureEach {
-    jvmArgs.plusAssign("--enable-preview")
+    jvmArgs?.plusAssign("--enable-preview")
 }
 
 tasks.withType<JavaExec>().configureEach {
-    jvmArgs.plusAssign("--enable-preview")
+    jvmArgs?.plusAssign("--enable-preview")
 }
\ No newline at end of file