diff --git a/build.gradle b/build.gradle
index adba4fec..d20c1656 100644
--- a/build.gradle
+++ b/build.gradle
@@ -41,6 +41,7 @@ allprojects {
 
     compileKotlin {
         kotlinOptions {
+            freeCompilerArgs = ['-Xjvm-default=enable']
             jvmTarget = "1.8"
             javaParameters = true
         }
@@ -48,7 +49,7 @@ allprojects {
 
     compileTestKotlin {
         kotlinOptions {
-            freeCompilerArgs = ['-Xenable-jvm-default']
+            freeCompilerArgs = ['-Xjvm-default=enable']
             jvmTarget = "1.8"
             javaParameters = true
         }
diff --git a/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy b/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
index a892385a..cb8c597f 100644
--- a/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
+++ b/numass-main/src/main/groovy/inr/numass/LaunchGrindShell.groovy
@@ -2,6 +2,7 @@ package inr.numass
 
 import hep.dataforge.context.Global
 import hep.dataforge.grind.terminal.GrindTerminal
+import hep.dataforge.grind.workspace.GrindWorkspace
 import hep.dataforge.workspace.FileBasedWorkspace
 import hep.dataforge.workspace.Workspace
 
@@ -23,7 +24,7 @@ try {
     GrindTerminal.system().launch {
         if (cfgPath) {
             Workspace numass = FileBasedWorkspace.build(context, new File(cfgPath as String).toPath())
-            bind("numass", numass)
+            bind("numass", new GrindWorkspace(numass))
         } else {
             println "No configuration path. Provide path via --config option"
         }
diff --git a/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt b/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
index 2115b61a..9ded4f2b 100644
--- a/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
+++ b/numass-main/src/main/kotlin/inr/numass/NumassPlugin.kt
@@ -43,7 +43,7 @@ import org.apache.commons.math3.util.FastMath
 @PluginDef(
         group = "inr.numass",
         name = "numass",
-        dependsOn = arrayOf("hep.dataforge:functions", "hep.dataforge:MINUIT", "hep.dataforge:actions"),
+        dependsOn = ["hep.dataforge:functions", "hep.dataforge:MINUIT", "hep.dataforge:actions"],
         support = false,
         info = "Numass data analysis tools"
 )