diff --git a/plugins/kotlinx-serialization/kotlinx-serialization.common/src/org/jetbrains/kotlinx/serialization/compiler/resolve/NamingConventions.kt b/plugins/kotlinx-serialization/kotlinx-serialization.common/src/org/jetbrains/kotlinx/serialization/compiler/resolve/NamingConventions.kt
index 61b1863ede7ed..7c2eed27fa750 100644
--- a/plugins/kotlinx-serialization/kotlinx-serialization.common/src/org/jetbrains/kotlinx/serialization/compiler/resolve/NamingConventions.kt
+++ b/plugins/kotlinx-serialization/kotlinx-serialization.common/src/org/jetbrains/kotlinx/serialization/compiler/resolve/NamingConventions.kt
@@ -252,6 +252,7 @@ fun findStandardKotlinTypeSerializerName(typeName: String?): String? {
         "kotlin.DoubleArray" -> "DoubleArraySerializer"
         "kotlin.BooleanArray" -> "BooleanArraySerializer"
         "kotlin.time.Duration" -> "DurationSerializer"
+        "kotlin.time.Instant" -> "InstantSerializer"
         "kotlin.uuid.Uuid" -> "UuidSerializer"
         "java.lang.Boolean" -> "BooleanSerializer"
         "java.lang.Byte" -> "ByteSerializer"
diff --git a/plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt b/plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt
new file mode 100644
index 0000000000000..44c01dab6e15f
--- /dev/null
+++ b/plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt
@@ -0,0 +1,43 @@
+// WITH_STDLIB
+// API_VERSION: LATEST
+// OPT_IN: kotlin.time.ExperimentalTime
+
+// FILE: serializer.kt
+
+package kotlinx.serialization.internal
+
+import kotlin.time.*
+import kotlinx.serialization.*
+import kotlinx.serialization.encoding.*
+import kotlinx.serialization.descriptors.*
+
+// TODO: delete when serialization runtime is updated to 1.9.0
+internal object InstantSerializer : KSerializer<Instant> {
+    override val descriptor: SerialDescriptor = PrimitiveSerialDescriptor("kotlin.time.Instant", PrimitiveKind.STRING)
+
+    override fun serialize(encoder: Encoder, value: Instant) {
+        encoder.encodeString(value.toString())
+    }
+
+    override fun deserialize(decoder: Decoder): Instant {
+        return Instant.parse(decoder.decodeString())
+    }
+}
+
+// FILE: test.kt
+
+package a
+
+import kotlin.time.*
+import kotlinx.serialization.*
+import kotlinx.serialization.json.*
+
+@Serializable
+class Holder(val i: Instant)
+
+fun box(): String {
+    val h = Holder(Instant.parse("2025-01-04T23:59:14.0001242Z"))
+    val msg = Json.encodeToString(h)
+    return if (msg == """{"i":"2025-01-04T23:59:14.000124200Z"}""") "OK" else "FAIL: $msg"
+}
+
diff --git a/plugins/kotlinx-serialization/testData/boxIr/uuidSerializer.kt b/plugins/kotlinx-serialization/testData/boxIr/uuidSerializer.kt
index da6f9cddb0748..f12b6c5aa06d5 100644
--- a/plugins/kotlinx-serialization/testData/boxIr/uuidSerializer.kt
+++ b/plugins/kotlinx-serialization/testData/boxIr/uuidSerializer.kt
@@ -38,9 +38,8 @@ import kotlinx.serialization.json.*
 class Holder(val u: Uuid)
 
 fun box(): String {
-    return "OK"
     val h = Holder(Uuid.parse("bc501c76-d806-4578-b45e-97a264e280f1"))
     val msg = Json.encodeToString(h)
-    return if (msg == """{"uuid":"bc501c76-d806-4578-b45e-97a264e280f1"}""") "OK" else "FAIL: $msg"
+    return if (msg == """{"u":"bc501c76-d806-4578-b45e-97a264e280f1"}""") "OK" else "FAIL: $msg"
 }
 
diff --git a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLReversedSerializationBlackBoxTestGenerated.java b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLReversedSerializationBlackBoxTestGenerated.java
index b0b08c6f7abac..10c74cdca9504 100644
--- a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLReversedSerializationBlackBoxTestGenerated.java
+++ b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLReversedSerializationBlackBoxTestGenerated.java
@@ -170,6 +170,12 @@ public void testInlineClasses() {
       runTest("plugins/kotlinx-serialization/testData/boxIr/inlineClasses.kt");
     }
 
+    @Test
+    @TestMetadata("instantSerializer.kt")
+    public void testInstantSerializer() {
+      runTest("plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt");
+    }
+
     @Test
     @TestMetadata("interfaces.kt")
     public void testInterfaces() {
diff --git a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLSerializationBlackBoxTestGenerated.java b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLSerializationBlackBoxTestGenerated.java
index cbe50df54226f..a978c6e248904 100644
--- a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLSerializationBlackBoxTestGenerated.java
+++ b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/LLSerializationBlackBoxTestGenerated.java
@@ -170,6 +170,12 @@ public void testInlineClasses() {
       runTest("plugins/kotlinx-serialization/testData/boxIr/inlineClasses.kt");
     }
 
+    @Test
+    @TestMetadata("instantSerializer.kt")
+    public void testInstantSerializer() {
+      runTest("plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt");
+    }
+
     @Test
     @TestMetadata("interfaces.kt")
     public void testInterfaces() {
diff --git a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirJsBoxTestGenerated.java b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirJsBoxTestGenerated.java
index c2baf48f32665..56a15da97e5aa 100644
--- a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirJsBoxTestGenerated.java
+++ b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirJsBoxTestGenerated.java
@@ -126,6 +126,12 @@ public void testGenerics() {
     runTest("plugins/kotlinx-serialization/testData/boxIr/generics.kt");
   }
 
+  @Test
+  @TestMetadata("instantSerializer.kt")
+  public void testInstantSerializer() {
+    runTest("plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt");
+  }
+
   @Test
   @TestMetadata("interfaces.kt")
   public void testInterfaces() {
diff --git a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirLightTreeBlackBoxTestGenerated.java b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirLightTreeBlackBoxTestGenerated.java
index 284ba272fc834..978f22df956c6 100644
--- a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirLightTreeBlackBoxTestGenerated.java
+++ b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationFirLightTreeBlackBoxTestGenerated.java
@@ -159,6 +159,12 @@ public void testInlineClasses() {
       runTest("plugins/kotlinx-serialization/testData/boxIr/inlineClasses.kt");
     }
 
+    @Test
+    @TestMetadata("instantSerializer.kt")
+    public void testInstantSerializer() {
+      runTest("plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt");
+    }
+
     @Test
     @TestMetadata("interfaces.kt")
     public void testInterfaces() {
diff --git a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrBoxTestGenerated.java b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrBoxTestGenerated.java
index 60b1b17461630..719ebe5a3730b 100644
--- a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrBoxTestGenerated.java
+++ b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrBoxTestGenerated.java
@@ -156,6 +156,12 @@ public void testInlineClasses() {
     runTest("plugins/kotlinx-serialization/testData/boxIr/inlineClasses.kt");
   }
 
+  @Test
+  @TestMetadata("instantSerializer.kt")
+  public void testInstantSerializer() {
+    runTest("plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt");
+  }
+
   @Test
   @TestMetadata("interfaces.kt")
   public void testInterfaces() {
diff --git a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrJsBoxTestGenerated.java b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrJsBoxTestGenerated.java
index f6c3a5082f865..ba7f686509c35 100644
--- a/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrJsBoxTestGenerated.java
+++ b/plugins/kotlinx-serialization/tests-gen/org/jetbrains/kotlinx/serialization/runners/SerializationIrJsBoxTestGenerated.java
@@ -126,6 +126,12 @@ public void testGenerics() {
     runTest("plugins/kotlinx-serialization/testData/boxIr/generics.kt");
   }
 
+  @Test
+  @TestMetadata("instantSerializer.kt")
+  public void testInstantSerializer() {
+    runTest("plugins/kotlinx-serialization/testData/boxIr/instantSerializer.kt");
+  }
+
   @Test
   @TestMetadata("interfaces.kt")
   public void testInterfaces() {