diff --git a/lib/prawn/images.rb b/lib/prawn/images.rb
index 168e6f3f0..75fd45adb 100644
--- a/lib/prawn/images.rb
+++ b/lib/prawn/images.rb
@@ -137,11 +137,11 @@ def embed_image(pdf_obj, info, options)
 
     def verify_and_open_image(io_or_path)
       # File or IO
-      if io_or_path.respond_to?(:rewind)
+      if io_or_path.respond_to?(:read)
         io = io_or_path
         # Rewind if the object we're passed is an IO, so that multiple embeds of
         # the same IO object will work
-        io.rewind
+        io.rewind if io.respond_to?(:rewind)
         # read the file as binary so the size is calculated correctly
         # guard binmode because some objects acting io-like don't implement it
         io.binmode if io.respond_to?(:binmode)