diff --git a/libvirt-override.c b/libvirt-override.c
index 59c1e0c..580c259 100644
--- a/libvirt-override.c
+++ b/libvirt-override.c
@@ -8668,7 +8668,7 @@ libvirt_virDomainListGetStats(PyObject *self ATTRIBUTE_UNUSED,
 static virPyTypedParamsHint virPyDomainBlockCopyParams[] = {
     { VIR_DOMAIN_BLOCK_COPY_BANDWIDTH, VIR_TYPED_PARAM_ULLONG },
     { VIR_DOMAIN_BLOCK_COPY_GRANULARITY, VIR_TYPED_PARAM_UINT },
-    { VIR_DOMAIN_BLOCK_COPY_BUF_SIZE, VIR_TYPED_PARAM_UINT },
+    { VIR_DOMAIN_BLOCK_COPY_BUF_SIZE, VIR_TYPED_PARAM_ULLONG },
 };