diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
index 5ee0abe7862..1820ff3c8b8 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java
@@ -18036,6 +18036,12 @@ public class FirOldFrontendDiagnosticsTestGenerated extends AbstractFirDiagnosti
                     runTest("compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClass.kt");
                 }
 
+                @Test
+                @TestMetadata("expectSealedClassWithActualTypealias.kt")
+                public void testExpectSealedClassWithActualTypealias() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClassWithActualTypealias.kt");
+                }
+
                 @Test
                 @TestMetadata("expectSealedInterface.kt")
                 public void testExpectSealedInterface() throws Exception {
diff --git a/compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClassWithActualTypealias.kt b/compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClassWithActualTypealias.kt
new file mode 100644
index 00000000000..d9c2ae04c6e
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClassWithActualTypealias.kt
@@ -0,0 +1,25 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +MultiPlatformProjects
+// ISSUE: KT-45796
+// SKIP_TXT
+
+// MODULE: m1-common
+expect sealed class SealedClass()
+
+class Derived1 : SealedClass()
+
+// MODULE: m1-jvm(m1-common)
+actual typealias SealedClass = MySealedClass
+
+sealed class MySealedClass
+
+class Derived2 : SealedClass()
+class Derived3 : MySealedClass()
+
+fun whenForSealed(s: SealedClass): Int {
+    return when (s) { // Should be OK
+        is Derived1 -> 1
+        is Derived2 -> 2
+        is Derived3 -> 3
+    }
+}
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
index 372d5e61ac6..c1f60529aa7 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
@@ -18042,6 +18042,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                     runTest("compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClass.kt");
                 }
 
+                @Test
+                @TestMetadata("expectSealedClassWithActualTypealias.kt")
+                public void testExpectSealedClassWithActualTypealias() throws Exception {
+                    runTest("compiler/testData/diagnostics/tests/multiplatform/exhaustiveness/expectSealedClassWithActualTypealias.kt");
+                }
+
                 @Test
                 @TestMetadata("expectSealedInterface.kt")
                 public void testExpectSealedInterface() throws Exception {
diff --git a/core/descriptors/src/org/jetbrains/kotlin/resolve/SealedClassInheritorsProvider.kt b/core/descriptors/src/org/jetbrains/kotlin/resolve/SealedClassInheritorsProvider.kt
index b73d6230fd3..ee7805389f9 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/resolve/SealedClassInheritorsProvider.kt
+++ b/core/descriptors/src/org/jetbrains/kotlin/resolve/SealedClassInheritorsProvider.kt
@@ -8,14 +8,12 @@ package org.jetbrains.kotlin.resolve
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
-import org.jetbrains.kotlin.incremental.components.LookupLocation
+import org.jetbrains.kotlin.descriptors.TypeAliasDescriptor
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.resolve.descriptorUtil.parents
 import org.jetbrains.kotlin.resolve.scopes.DescriptorKindFilter
 import org.jetbrains.kotlin.resolve.scopes.MemberScope
-import org.jetbrains.kotlin.types.checker.KotlinTypeRefiner
 import org.jetbrains.kotlin.types.refinement.TypeRefinement
-import org.jetbrains.kotlin.utils.addToStdlib.runIf
 
 abstract class SealedClassInheritorsProvider {
     /**
@@ -48,9 +46,15 @@ object CliSealedClassInheritorsProvider : SealedClassInheritorsProvider() {
                  *   of theirs actuals, so we need to lookup for descriptor once again via
                  *   scope.getContributedClassifier() to match expects (if possible)
                  */
-                val refinedDescriptor = runIf(descriptor.isExpect) {
-                    scope.getContributedClassifier(descriptor.name, NoLookupLocation.WHEN_GET_ALL_DESCRIPTORS) as? ClassDescriptor
-                } ?: descriptor
+                val refinedDescriptor = if (descriptor.isExpect) {
+                    when (val actualDescriptor = scope.getContributedClassifier(descriptor.name, NoLookupLocation.WHEN_GET_ALL_DESCRIPTORS)) {
+                        is ClassDescriptor -> actualDescriptor
+                        is TypeAliasDescriptor -> actualDescriptor.classDescriptor
+                        else -> null
+                    }
+                } else {
+                    descriptor
+                } ?: continue
 
                 if (DescriptorUtils.isDirectSubclass(refinedDescriptor, sealedClass)) {
                     result.add(refinedDescriptor)