diff --git a/hw/display/virtio-gpu-3d.c b/hw/display/virtio-gpu-3d.c
index 758d33a09d..23f39de94d 100644
--- a/hw/display/virtio-gpu-3d.c
+++ b/hw/display/virtio-gpu-3d.c
@@ -347,6 +347,7 @@ static void virgl_cmd_get_capset_info(VirtIOGPU *g,
 
     VIRTIO_GPU_FILL_CMD(info);
 
+    memset(&resp, 0, sizeof(resp));
     if (info.capset_index == 0) {
         resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL;
         virgl_renderer_get_cap_set(resp.capset_id,