diff --git a/pdf2zh/pdfinterp.py b/pdf2zh/pdfinterp.py
index 62ff4ed3..f49c402b 100644
--- a/pdf2zh/pdfinterp.py
+++ b/pdf2zh/pdfinterp.py
@@ -224,6 +224,8 @@ def do_Do(self, xobjid_arg: PDFStackT) -> None:
                 [xobj],
                 ctm=ctm,
             )
+            self.ncs = interpreter.ncs
+            self.scs = interpreter.scs
             try:  # 有的时候 form 字体加不上这里会烂掉
                 self.device.fontid = interpreter.fontid
                 self.device.fontmap = interpreter.fontmap