diff --git a/dlls/wined3d/buffer.c b/dlls/wined3d/buffer.c
index b299fe775e0..e953e9ad215 100644
--- a/dlls/wined3d/buffer.c
+++ b/dlls/wined3d/buffer.c
@@ -1191,7 +1191,7 @@ static void wined3d_buffer_unmap(struct wined3d_buffer *buffer)
     }
 }
 
-HRESULT wined3d_buffer_copy(struct wined3d_buffer *dst_buffer, unsigned int dst_offset,
+void wined3d_buffer_copy(struct wined3d_buffer *dst_buffer, unsigned int dst_offset,
         struct wined3d_buffer *src_buffer, unsigned int src_offset, unsigned int size)
 {
     struct wined3d_bo_address dst, src;
@@ -1213,8 +1213,6 @@ HRESULT wined3d_buffer_copy(struct wined3d_buffer *dst_buffer, unsigned int dst_
     context_release(context);
 
     wined3d_buffer_invalidate_range(dst_buffer, ~dst_location, dst_offset, size);
-
-    return WINED3D_OK;
 }
 
 void wined3d_buffer_upload_data(struct wined3d_buffer *buffer, struct wined3d_context *context,
diff --git a/dlls/wined3d/cs.c b/dlls/wined3d/cs.c
index bc1bf17c101..a76598ff4ca 100644
--- a/dlls/wined3d/cs.c
+++ b/dlls/wined3d/cs.c
@@ -1952,10 +1952,9 @@ static void wined3d_cs_exec_blt_sub_resource(struct wined3d_cs *cs, const void *
 
     if (op->dst_resource->type == WINED3D_RTYPE_BUFFER)
     {
-        if (FAILED(wined3d_buffer_copy(buffer_from_resource(op->dst_resource), op->dst_box.left,
+        wined3d_buffer_copy(buffer_from_resource(op->dst_resource), op->dst_box.left,
                 buffer_from_resource(op->src_resource), op->src_box.left,
-                op->src_box.right - op->src_box.left)))
-            ERR("Failed to copy buffer.\n");
+                op->src_box.right - op->src_box.left);
     }
     else if (op->dst_resource->type == WINED3D_RTYPE_TEXTURE_2D)
     {
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index f17cc765cfd..f8aeb629c92 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -3568,7 +3568,7 @@ void wined3d_buffer_load(struct wined3d_buffer *buffer, struct wined3d_context *
 BOOL wined3d_buffer_load_location(struct wined3d_buffer *buffer,
         struct wined3d_context *context, DWORD location) DECLSPEC_HIDDEN;
 BYTE *wined3d_buffer_load_sysmem(struct wined3d_buffer *buffer, struct wined3d_context *context) DECLSPEC_HIDDEN;
-HRESULT wined3d_buffer_copy(struct wined3d_buffer *dst_buffer, unsigned int dst_offset,
+void wined3d_buffer_copy(struct wined3d_buffer *dst_buffer, unsigned int dst_offset,
         struct wined3d_buffer *src_buffer, unsigned int src_offset, unsigned int size) DECLSPEC_HIDDEN;
 void wined3d_buffer_upload_data(struct wined3d_buffer *buffer, struct wined3d_context *context,
         const struct wined3d_box *box, const void *data) DECLSPEC_HIDDEN;