diff --git a/src/main/kotlin/io/kotest/extensions/testcontainers/JdbcDatabaseContainerExtension.kt b/src/main/kotlin/io/kotest/extensions/testcontainers/JdbcDatabaseContainerExtension.kt
index b0755ef..36d168c 100644
--- a/src/main/kotlin/io/kotest/extensions/testcontainers/JdbcDatabaseContainerExtension.kt
+++ b/src/main/kotlin/io/kotest/extensions/testcontainers/JdbcDatabaseContainerExtension.kt
@@ -93,15 +93,15 @@ class JdbcDatabaseContainerExtension(
    }
 
    override suspend fun beforeTest(testCase: TestCase) {
-      beforeTest(testCase, dataSource ?: error("Datasource not initialized"))
+      beforeTest.invoke(testCase, dataSource ?: error("Datasource not initialized"))
    }
 
    override suspend fun afterTest(testCase: TestCase, result: TestResult) {
-      afterTest(testCase, dataSource ?: error("Datasource not initialized"))
+      afterTest.invoke(testCase, dataSource ?: error("Datasource not initialized"))
    }
 
    override suspend fun beforeSpec(spec: Spec) {
-      beforeSpec(spec)
+      beforeSpec.invoke(spec)
    }
 
    override suspend fun afterSpec(spec: Spec) {
diff --git a/src/test/kotlin/io/kotest/extensions/testcontainers/SharedJdbcDatabaseContainerExtensionTest.kt b/src/test/kotlin/io/kotest/extensions/testcontainers/SharedJdbcDatabaseContainerExtensionTest.kt
index d0ba556..f861d04 100644
--- a/src/test/kotlin/io/kotest/extensions/testcontainers/SharedJdbcDatabaseContainerExtensionTest.kt
+++ b/src/test/kotlin/io/kotest/extensions/testcontainers/SharedJdbcDatabaseContainerExtensionTest.kt
@@ -14,15 +14,15 @@ private val mysql = MySQLContainer<Nothing>("mysql:8.0.26").apply {
    withUrlParam("zeroDateTimeBehavior", "convertToNull")
 }
 
-private val ext = SharedJdbcDatabaseContainerExtension(mysql) {
-   maximumPoolSize = 8
-   minimumIdle = 4
-}
+private val ext = JdbcDatabaseContainerExtension(mysql)
 
 class SharedJdbcTestContainerExtensionSpecTest1 : FunSpec() {
    init {
 
-      val ds = install(ext)
+      val ds = install(ext) {
+         maximumPoolSize = 8
+         minimumIdle = 4
+      }
 
       test("should initialize once per module") {
          ds.connection.use {