diff --git a/src/main/java/org/springframework/data/mapping/model/ClassGeneratingPropertyAccessorFactory.java b/src/main/java/org/springframework/data/mapping/model/ClassGeneratingPropertyAccessorFactory.java
index 6a8f8833e..83a761604 100644
--- a/src/main/java/org/springframework/data/mapping/model/ClassGeneratingPropertyAccessorFactory.java
+++ b/src/main/java/org/springframework/data/mapping/model/ClassGeneratingPropertyAccessorFactory.java
@@ -1115,9 +1115,7 @@ public class ClassGeneratingPropertyAccessorFactory implements PersistentPropert
 					visitDefaultValue(parameterTypes[i], mv);
 				}
 
-				copyByProperty.getDefaultMask().forEach(i -> {
-					mv.visitIntInsn(Opcodes.SIPUSH, i);
-				});
+				copyByProperty.getDefaultMask().forEach(mv::visitLdcInsn);
 
 				mv.visitInsn(Opcodes.ACONST_NULL);
 
diff --git a/src/test/java/org/springframework/data/mapping/model/PersistentPropertyAccessorTests.java b/src/test/java/org/springframework/data/mapping/model/PersistentPropertyAccessorTests.java
index e8e01a46c..a3b0c6a53 100644
--- a/src/test/java/org/springframework/data/mapping/model/PersistentPropertyAccessorTests.java
+++ b/src/test/java/org/springframework/data/mapping/model/PersistentPropertyAccessorTests.java
@@ -140,6 +140,19 @@ public class PersistentPropertyAccessorTests {
 		assertThatThrownBy(() -> accessor.setProperty(property, 1)).isInstanceOf(UnsupportedOperationException.class);
 	}
 
+	@Test // DATACMNS-1451
+	public void shouldSet17thImmutableNullableKotlinProperty() {
+
+		With33Args bean = new With33Args();
+		PersistentPropertyAccessor accessor = propertyAccessorFunction.apply(bean);
+		SamplePersistentProperty property = getProperty(bean, "17");
+
+		accessor.setProperty(property, "foo");
+
+		With33Args updated = (With33Args) accessor.getBean();
+		assertThat(updated.get17()).isEqualTo("foo");
+	}
+
 	@Test // DATACMNS-1322
 	public void shouldWitherProperty() {