diff --git a/dlls/opcservices/package.c b/dlls/opcservices/package.c
index eb9c1c9f5a0..f3503945b5b 100644
--- a/dlls/opcservices/package.c
+++ b/dlls/opcservices/package.c
@@ -607,6 +607,7 @@ static HRESULT WINAPI opc_content_stream_Seek(IStream *iface, LARGE_INTEGER move
         break;
     case STREAM_SEEK_END:
         pos.QuadPart = stream->content->size.QuadPart + move.QuadPart;
+        break;
     default:
         WARN("Unknown origin mode %d.\n", origin);
         return E_INVALIDARG;