diff --git a/virtualization_14.h b/virtualization_14.h
index c962269..97d06c1 100644
--- a/virtualization_14.h
+++ b/virtualization_14.h
@@ -22,8 +22,10 @@ void *newVZNVMExpressControllerDeviceConfiguration(void *attachment);
 void *newVZDiskBlockDeviceStorageDeviceAttachment(int fileDescriptor, bool readOnly, int syncMode, void **error);
 void *newVZNetworkBlockDeviceStorageDeviceAttachment(const char *url, double timeout, bool forcedReadOnly, int syncMode, void **error, uintptr_t cgoHandle);
 
+#ifdef INCLUDE_TARGET_OSX_14
 @interface VZNetworkBlockDeviceStorageDeviceAttachmentDelegateImpl : NSObject <VZNetworkBlockDeviceStorageDeviceAttachmentDelegate>
 - (instancetype)initWithHandle:(uintptr_t)cgoHandle;
 - (void)attachment:(VZNetworkBlockDeviceStorageDeviceAttachment *)attachment didEncounterError:(NSError *)error API_AVAILABLE(macos(14.0));
 - (void)attachmentWasConnected:(VZNetworkBlockDeviceStorageDeviceAttachment *)attachment API_AVAILABLE(macos(14.0));
 @end
+#endif
diff --git a/virtualization_14.m b/virtualization_14.m
index 9fbe6e4..b6970f0 100644
--- a/virtualization_14.m
+++ b/virtualization_14.m
@@ -91,6 +91,7 @@
     RAISE_UNSUPPORTED_MACOS_EXCEPTION();
 }
 
+#ifdef INCLUDE_TARGET_OSX_14
 @implementation VZNetworkBlockDeviceStorageDeviceAttachmentDelegateImpl {
     uintptr_t _cgoHandle;
 }
@@ -112,3 +113,4 @@ - (void)attachmentWasConnected:(VZNetworkBlockDeviceStorageDeviceAttachment *)at
     attachmentWasConnectedHandler(_cgoHandle);
 }
 @end
+#endif