diff --git a/build.gradle.kts b/build.gradle.kts
index 0b60dd4..a78d5aa 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -213,7 +213,7 @@ allprojects {
                     "-Xjvm-default=all", "-Xlambdas=indy", "-Xtype-enhancement-improvements-strict-mode",
                     "-Xmultifile-parts-inherit",
                     "-Xbackend-threads=0", "-Xno-param-assertions", "-Xno-call-assertions",
-                    "-Xopt-in=kotlin.RequiresOptIn", "-Xextended-compiler-checks", "-Xassertions=jvm", "-progressive"
+                    "-opt-in=kotlin.RequiresOptIn", "-Xextended-compiler-checks", "-Xassertions=jvm", "-progressive"
                 )
                 jvmTarget = if (javaVer.toInt() < 9) "1.$javaVer" else javaVer
                 languageVersion = (kotlinSplitVersion[0] + '.' + (kotlinSplitVersion[1].toShort() + 1).toString())