diff --git a/spring-core/src/main/java/org/springframework/core/CoroutinesUtils.java b/spring-core/src/main/java/org/springframework/core/CoroutinesUtils.java
index 687101c5b075..d36d59376fa5 100644
--- a/spring-core/src/main/java/org/springframework/core/CoroutinesUtils.java
+++ b/spring-core/src/main/java/org/springframework/core/CoroutinesUtils.java
@@ -28,9 +28,11 @@
 import kotlin.reflect.KClassifier;
 import kotlin.reflect.KFunction;
 import kotlin.reflect.KParameter;
+import kotlin.reflect.KType;
 import kotlin.reflect.full.KCallables;
 import kotlin.reflect.full.KClasses;
 import kotlin.reflect.jvm.KCallablesJvm;
+import kotlin.reflect.jvm.KTypesJvm;
 import kotlin.reflect.jvm.ReflectJvmMapping;
 import kotlinx.coroutines.BuildersKt;
 import kotlinx.coroutines.CoroutineStart;
@@ -117,19 +119,14 @@ public static Publisher<?> invokeSuspendingFunction(CoroutineContext context, Me
 							case VALUE, EXTENSION_RECEIVER -> {
 								Object arg = args[index];
 								if (!(parameter.isOptional() && arg == null)) {
-									if (parameter.getType().getClassifier() instanceof KClass<?> kClass) {
-										Class<?> javaClass = JvmClassMappingKt.getJavaClass(kClass);
-										if (KotlinDetector.isInlineClass(javaClass)
-												&& !(parameter.getType().isMarkedNullable() && arg == null)) {
-											argMap.put(parameter, KClasses.getPrimaryConstructor(kClass).call(arg));
+									KType type = parameter.getType();
+									if (!(type.isMarkedNullable() && arg == null)) {
+										KClass<?> kClass = KTypesJvm.getJvmErasure(type);
+										if (KotlinDetector.isInlineClass(JvmClassMappingKt.getJavaClass(kClass))) {
+											arg = KClasses.getPrimaryConstructor(kClass).call(arg);
 										}
-										else {
-											argMap.put(parameter, arg);
-										}
-									}
-									else {
-										argMap.put(parameter, arg);
 									}
+									argMap.put(parameter, arg);
 								}
 								index++;
 							}
diff --git a/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java b/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java
index 5bdc816d23f7..918ce2226d7c 100644
--- a/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java
+++ b/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java
@@ -26,8 +26,10 @@
 import kotlin.reflect.KClass;
 import kotlin.reflect.KFunction;
 import kotlin.reflect.KParameter;
+import kotlin.reflect.KType;
 import kotlin.reflect.full.KClasses;
 import kotlin.reflect.jvm.KCallablesJvm;
+import kotlin.reflect.jvm.KTypesJvm;
 import kotlin.reflect.jvm.ReflectJvmMapping;
 
 import org.springframework.context.MessageSource;
@@ -315,19 +317,14 @@ public static Object invokeFunction(Method method, Object target, Object[] args)
 					case VALUE, EXTENSION_RECEIVER -> {
 						Object arg = args[index];
 						if (!(parameter.isOptional() && arg == null)) {
-							if (parameter.getType().getClassifier() instanceof KClass<?> kClass) {
-								Class<?> javaClass = JvmClassMappingKt.getJavaClass(kClass);
-								if (KotlinDetector.isInlineClass(javaClass)
-										&& !(parameter.getType().isMarkedNullable() && arg == null)) {
-									argMap.put(parameter, KClasses.getPrimaryConstructor(kClass).call(arg));
+							KType type = parameter.getType();
+							if (!(type.isMarkedNullable() && arg == null)) {
+								KClass<?> kClass = KTypesJvm.getJvmErasure(type);
+								if (KotlinDetector.isInlineClass(JvmClassMappingKt.getJavaClass(kClass))) {
+									arg = KClasses.getPrimaryConstructor(kClass).call(arg);
 								}
-								else {
-									argMap.put(parameter, arg);
-								}
-							}
-							else {
-								argMap.put(parameter, arg);
 							}
+							argMap.put(parameter, arg);
 						}
 						index++;
 					}
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java
index bab33e84d9fc..de362ea27a91 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java
@@ -31,8 +31,10 @@
 import kotlin.reflect.KClass;
 import kotlin.reflect.KFunction;
 import kotlin.reflect.KParameter;
+import kotlin.reflect.KType;
 import kotlin.reflect.full.KClasses;
 import kotlin.reflect.jvm.KCallablesJvm;
+import kotlin.reflect.jvm.KTypesJvm;
 import kotlin.reflect.jvm.ReflectJvmMapping;
 import reactor.core.publisher.Mono;
 
@@ -326,19 +328,14 @@ public static Object invokeFunction(Method method, Object target, Object[] args,
 						case VALUE, EXTENSION_RECEIVER -> {
 							Object arg = args[index];
 							if (!(parameter.isOptional() && arg == null)) {
-								if (parameter.getType().getClassifier() instanceof KClass<?> kClass) {
-									Class<?> javaClass = JvmClassMappingKt.getJavaClass(kClass);
-									if (KotlinDetector.isInlineClass(javaClass)
-											&& !(parameter.getType().isMarkedNullable() && arg == null)) {
-										argMap.put(parameter, KClasses.getPrimaryConstructor(kClass).call(arg));
+								KType type = parameter.getType();
+								if (!(type.isMarkedNullable() && arg == null)) {
+									KClass<?> kClass = KTypesJvm.getJvmErasure(type);
+									if (KotlinDetector.isInlineClass(JvmClassMappingKt.getJavaClass(kClass))) {
+										arg = KClasses.getPrimaryConstructor(kClass).call(arg);
 									}
-									else {
-										argMap.put(parameter, arg);
-									}
-								}
-								else {
-									argMap.put(parameter, arg);
 								}
+								argMap.put(parameter, arg);
 							}
 							index++;
 						}