diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index e4ed93880..823f12492 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -378,7 +378,7 @@ class PngStream(ChunkStream):
         }
 
     def rewind(self):
-        self.im_info = self.rewind_state["info"]
+        self.im_info = self.rewind_state["info"].copy()
         self.im_tile = self.rewind_state["tile"]
         self._seq_num = self.rewind_state["seq_num"]