diff --git a/release/src/main/kotlin/com/bakdata/gradle/ReleasePlugin.kt b/release/src/main/kotlin/com/bakdata/gradle/ReleasePlugin.kt
index d77f547..65b9523 100644
--- a/release/src/main/kotlin/com/bakdata/gradle/ReleasePlugin.kt
+++ b/release/src/main/kotlin/com/bakdata/gradle/ReleasePlugin.kt
@@ -31,11 +31,13 @@ import org.gradle.api.Project
 import org.gradle.kotlin.dsl.apply
 import org.gradle.kotlin.dsl.configure
 
-const val DISABLE_PUSH_TO_REMOTE = "release.disablePushToRemote"
-const val REQUIRE_BRANCH = "release.requireBranch"
-
 class ReleasePlugin : Plugin<Project> {
 
+    companion object {
+        const val DISABLE_PUSH_TO_REMOTE = "release.disablePushToRemote"
+        const val REQUIRE_BRANCH = "release.requireBranch"
+    }
+
     override fun apply(rootProject: Project) {
         if (rootProject.parent != null) {
             throw GradleException("Apply this plugin only to the top-level project.")
diff --git a/release/src/test/kotlin/com/bakdata/gradle/ReleasePluginTest.kt b/release/src/test/kotlin/com/bakdata/gradle/ReleasePluginTest.kt
index 37203f7..90c8af4 100644
--- a/release/src/test/kotlin/com/bakdata/gradle/ReleasePluginTest.kt
+++ b/release/src/test/kotlin/com/bakdata/gradle/ReleasePluginTest.kt
@@ -24,6 +24,8 @@
 
 package com.bakdata.gradle
 
+import com.bakdata.gradle.ReleasePlugin.Companion.DISABLE_PUSH_TO_REMOTE
+import com.bakdata.gradle.ReleasePlugin.Companion.REQUIRE_BRANCH
 import net.researchgate.release.ReleaseExtension
 import net.researchgate.release.ReleasePlugin
 import org.assertj.core.api.Assertions.assertThat