diff --git a/spring-context/src/main/kotlin/org/springframework/context/support/BeanDefinitionDsl.kt b/spring-context/src/main/kotlin/org/springframework/context/support/BeanDefinitionDsl.kt
index 02243ab8ba3e..19bf94c0384c 100644
--- a/spring-context/src/main/kotlin/org/springframework/context/support/BeanDefinitionDsl.kt
+++ b/spring-context/src/main/kotlin/org/springframework/context/support/BeanDefinitionDsl.kt
@@ -76,7 +76,7 @@ fun beans(init: BeanDefinitionDsl.() -> Unit) = BeanDefinitionDsl(init)
  * @author Sebastien Deleuze
  * @since 5.0
  */
-open class BeanDefinitionDsl(private val init: BeanDefinitionDsl.() -> Unit,
+open class BeanDefinitionDsl internal constructor (private val init: BeanDefinitionDsl.() -> Unit,
 							 private val condition: (ConfigurableEnvironment) -> Boolean = { true })
 	: ApplicationContextInitializer<GenericApplicationContext> {
 
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt
index 7226d319b750..20bb0a0c9907 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockHttpServletRequestDsl.kt
@@ -40,7 +40,7 @@ import javax.servlet.http.Cookie
  * @author Sebastien Deleuze
  * @since 5.2
  */
-open class MockHttpServletRequestDsl(private val builder: MockHttpServletRequestBuilder) {
+open class MockHttpServletRequestDsl internal constructor (private val builder: MockHttpServletRequestBuilder) {
 
 	/**
 	 * @see [MockHttpServletRequestBuilder.contextPath]
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMultipartHttpServletRequestDsl.kt b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMultipartHttpServletRequestDsl.kt
index 503cae568200..1a2e83745a7d 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMultipartHttpServletRequestDsl.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMultipartHttpServletRequestDsl.kt
@@ -27,7 +27,7 @@ import javax.servlet.http.Part
  * @author Sebastien Deleuze
  * @since 5.2
  */
-class MockMultipartHttpServletRequestDsl(private val builder: MockMultipartHttpServletRequestBuilder) : MockHttpServletRequestDsl(builder) {
+class MockMultipartHttpServletRequestDsl internal constructor (private val builder: MockMultipartHttpServletRequestBuilder) : MockHttpServletRequestDsl(builder) {
 
 	/**
 	 * @see [MockMultipartHttpServletRequestBuilder.file]
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultHandlersDsl.kt b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultHandlersDsl.kt
index 72727ed14b20..c493b450de7d 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultHandlersDsl.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultHandlersDsl.kt
@@ -26,7 +26,7 @@ import java.io.Writer
  * @author Sebastien Deleuze
  * @since 5.2
  */
-class MockMvcResultHandlersDsl(private val actions: ResultActions) {
+class MockMvcResultHandlersDsl internal constructor (private val actions: ResultActions) {
 
 	/**
 	 * @see MockMvcResultHandlers.print
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultMatchersDsl.kt b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultMatchersDsl.kt
index b34f158afa81..6a5d90902589 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultMatchersDsl.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/MockMvcResultMatchersDsl.kt
@@ -25,7 +25,7 @@ import org.springframework.test.web.servlet.result.*
  * @author Sebastien Deleuze
  * @since 5.2
  */
-class MockMvcResultMatchersDsl(private val actions: ResultActions) {
+class MockMvcResultMatchersDsl internal constructor (private val actions: ResultActions) {
 
 	/**
 	 * @see MockMvcResultMatchers.request
diff --git a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/ResultActionsDsl.kt b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/ResultActionsDsl.kt
index 5c54df36d327..128b9492b8c4 100644
--- a/spring-test/src/main/kotlin/org/springframework/test/web/servlet/ResultActionsDsl.kt
+++ b/spring-test/src/main/kotlin/org/springframework/test/web/servlet/ResultActionsDsl.kt
@@ -8,7 +8,7 @@ import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
  * @author Sebastien Deleuze
  * @since 5.2
  */
-class ResultActionsDsl(private val actions: ResultActions, private val mockMvc: MockMvc) {
+class ResultActionsDsl internal constructor (private val actions: ResultActions, private val mockMvc: MockMvc) {
 
 	/**
 	 * Provide access to [MockMvcResultMatchersDsl] Kotlin DSL.
diff --git a/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/CoRouterFunctionDsl.kt b/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/CoRouterFunctionDsl.kt
index 2477e74475a9..e0724db28d01 100644
--- a/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/CoRouterFunctionDsl.kt
+++ b/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/CoRouterFunctionDsl.kt
@@ -63,7 +63,7 @@ fun coRouter(routes: (CoRouterFunctionDsl.() -> Unit)) =
  * @author Sebastien Deleuze
  * @since 5.2
  */
-class CoRouterFunctionDsl(private val init: (CoRouterFunctionDsl.() -> Unit)) {
+class CoRouterFunctionDsl internal constructor (private val init: (CoRouterFunctionDsl.() -> Unit)) {
 
 	@PublishedApi
 	internal val builder = RouterFunctions.route()
diff --git a/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/RouterFunctionDsl.kt b/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/RouterFunctionDsl.kt
index 305ccabee49a..69ead9e87e7b 100644
--- a/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/RouterFunctionDsl.kt
+++ b/spring-webflux/src/main/kotlin/org/springframework/web/reactive/function/server/RouterFunctionDsl.kt
@@ -60,7 +60,7 @@ fun router(routes: RouterFunctionDsl.() -> Unit) = RouterFunctionDsl(routes).bui
  * @author Yevhenii Melnyk
  * @since 5.0
  */
-class RouterFunctionDsl(private val init: RouterFunctionDsl.() -> Unit) {
+class RouterFunctionDsl internal constructor (private val init: RouterFunctionDsl.() -> Unit) {
 
 	@PublishedApi
 	internal val builder = RouterFunctions.route()
diff --git a/spring-webmvc/src/main/kotlin/org/springframework/web/servlet/function/RouterFunctionDsl.kt b/spring-webmvc/src/main/kotlin/org/springframework/web/servlet/function/RouterFunctionDsl.kt
index 1ae9e0488a9f..d4cb76d638a6 100644
--- a/spring-webmvc/src/main/kotlin/org/springframework/web/servlet/function/RouterFunctionDsl.kt
+++ b/spring-webmvc/src/main/kotlin/org/springframework/web/servlet/function/RouterFunctionDsl.kt
@@ -58,7 +58,7 @@ fun router(routes: (RouterFunctionDsl.() -> Unit)) = RouterFunctionDsl(routes).b
  * @author Sebastien Deleuze
  * @since 5.2
  */
-class RouterFunctionDsl(private val init: (RouterFunctionDsl.() -> Unit)) {
+class RouterFunctionDsl internal constructor (private val init: (RouterFunctionDsl.() -> Unit)) {
 
 	@PublishedApi
 	internal val builder = RouterFunctions.route()