diff --git a/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinFeature.kt b/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinFeature.kt
index 2b99e7dd..8cafd970 100644
--- a/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinFeature.kt
+++ b/src/main/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinFeature.kt
@@ -89,7 +89,7 @@ public enum class KotlinFeature(internal val enabledByDefault: Boolean) {
 
     public companion object {
         internal val defaults
-            get() = values().fold(BitSet(Int.SIZE_BITS)) { acc, cur ->
+            get() = entries.fold(BitSet(Int.SIZE_BITS)) { acc, cur ->
                 acc.apply { if (cur.enabledByDefault) this.or(cur.bitSet) }
             }
     }
diff --git a/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinModuleTest.kt b/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinModuleTest.kt
index 2199456d..6b8d065e 100644
--- a/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinModuleTest.kt
+++ b/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/KotlinModuleTest.kt
@@ -15,7 +15,7 @@ class KotlinModuleTest {
     @Test
     fun setKotlinFeatureTest() {
         val builder = KotlinModule.Builder().apply {
-            KotlinFeature.values().forEach { enable(it) }
+            KotlinFeature.entries.forEach { enable(it) }
         }
 
         assertTrue(builder.isEnabled(KotlinFeature.NullToEmptyCollection))
@@ -27,7 +27,7 @@ class KotlinModuleTest {
         assertTrue(builder.isEnabled(KotlinFeature.UseJavaDurationConversion))
 
         builder.apply {
-            KotlinFeature.values().forEach { disable(it) }
+            KotlinFeature.entries.forEach { disable(it) }
         }
 
         assertFalse(builder.isEnabled(KotlinFeature.NullToEmptyCollection))
@@ -84,7 +84,7 @@ class KotlinModuleTest {
         val module = KotlinModule.Builder().apply {
             withCacheSize(KotlinModule.CacheSize(123, 321))
 
-            KotlinFeature.values().forEach {
+            KotlinFeature.entries.forEach {
                 configure(it, enabled)
             }
         }.build()
diff --git a/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zIntegration/deser/FailNullForPrimitiveTest.kt b/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zIntegration/deser/FailNullForPrimitiveTest.kt
index 30218c35..cbea77bc 100644
--- a/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zIntegration/deser/FailNullForPrimitiveTest.kt
+++ b/src/test/kotlin/io/github/projectmapk/jackson/module/kogera/zIntegration/deser/FailNullForPrimitiveTest.kt
@@ -9,24 +9,42 @@ import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.assertThrows
 
 private class FailNullForPrimitiveTest {
-    data class Dto(
+    val mapper = jacksonObjectMapper()
+        .enable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES)
+
+    data class NoDefaultValue(
         val foo: Int,
         val bar: Int?
     )
 
     @Test
-    fun test() {
-        val mapper = jacksonObjectMapper()
-            .enable(DeserializationFeature.FAIL_ON_NULL_FOR_PRIMITIVES)
+    fun noDefaultValueTest() {
+        // If no default value is set, it will fail if undefined or null is entered
+        assertThrows<MismatchedInputException> {
+            mapper.readValue<NoDefaultValue>("{}")
+        }
 
         assertThrows<MismatchedInputException> {
-            mapper.readValue<Dto>("{}")
+            mapper.readValue<NoDefaultValue>("""{"foo":null}""")
         }
 
+        assertEquals(NoDefaultValue(0, null), mapper.readValue<NoDefaultValue>("""{"foo":0}"""))
+    }
+
+    data class HasDefaultValue(
+        val foo: Int = -1,
+        val bar: Int? = -1
+    )
+
+    @Test
+    fun hasDefaultValueTest() {
+        // If a default value is set, an input of undefined will succeed, but null will fail
+        assertEquals(HasDefaultValue(-1, -1), mapper.readValue<HasDefaultValue>("{}"))
+
         assertThrows<MismatchedInputException> {
-            mapper.readValue<Dto>("""{"foo":null}""")
+            mapper.readValue<HasDefaultValue>("""{"foo":null}""")
         }
 
-        assertEquals(Dto(0, null), mapper.readValue<Dto>("""{"foo":0}"""))
+        assertEquals(HasDefaultValue(0, null), mapper.readValue<HasDefaultValue>("""{"foo":0, "bar":null}"""))
     }
 }