diff --git a/src/kits/storage/disk_device/DiskSystemAddOnManager.cpp b/src/kits/storage/disk_device/DiskSystemAddOnManager.cpp
index 3fb1f8d348..5321d8b107 100644
--- a/src/kits/storage/disk_device/DiskSystemAddOnManager.cpp
+++ b/src/kits/storage/disk_device/DiskSystemAddOnManager.cpp
@@ -58,7 +58,8 @@ struct DiskSystemAddOnManager::AddOnImage {
 struct DiskSystemAddOnManager::AddOn {
 	AddOn(AddOnImage* image, BDiskSystemAddOn* addOn)
 		: image(image),
-		  addOn(addOn)
+		  addOn(addOn),
+		  refCount(1)
 	{
 	}