diff --git a/src/lib.rs b/src/lib.rs
index 6d6d19e..21f34a0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -196,11 +196,11 @@ struct VgpuProfileOverride<'a> {
     multi_vgpu_supported: Option<u32>,
     pci_id: Option<u64>,
     pci_device_id: Option<u64>,
-    #[serde(with = "human_number")]
+    #[serde(default, with = "human_number")]
     framebuffer: Option<u64>,
-    #[serde(with = "human_number")]
+    #[serde(default, with = "human_number")]
     mappable_video_size: Option<u64>,
-    #[serde(with = "human_number")]
+    #[serde(default, with = "human_number")]
     framebuffer_reservation: Option<u64>,
     encoder_capacity: Option<u64>,
     bar1_length: Option<u64>,