diff --git a/README.adoc b/README.adoc
index e5661da..f9c222d 100644
--- a/README.adoc
+++ b/README.adoc
@@ -103,7 +103,7 @@ This feature can be enabled by adding the `-Xjsr305` compiler flag with the `str
 ----
 tasks.withType<KotlinCompile> {
 	kotlinOptions {
-		freeCompilerArgs = listOf("-Xjsr305=strict")
+		freeCompilerArgs += "-Xjsr305=strict"
 	}
 }
 ----
diff --git a/build.gradle.kts b/build.gradle.kts
index 85136e1..7641ae7 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -39,7 +39,7 @@ dependencies {
 
 tasks.withType<KotlinCompile> {
 	kotlinOptions {
-		freeCompilerArgs = listOf("-Xjsr305=strict")
+		freeCompilerArgs += "-Xjsr305=strict"
 	}
 }