diff --git a/pdfminer/pdfpage.py b/pdfminer/pdfpage.py
index 409c1fb..c0e1736 100644
--- a/pdfminer/pdfpage.py
+++ b/pdfminer/pdfpage.py
@@ -53,7 +53,7 @@ class PDFPage(object):
             self.cropbox = resolve1(self.attrs['CropBox'])
         else:
             self.cropbox = self.mediabox
-        self.rotate = (self.attrs.get('Rotate', 0)+360) % 360
+        self.rotate = (int_value(self.attrs.get('Rotate', 0))+360) % 360
         self.annots = self.attrs.get('Annots')
         self.beads = self.attrs.get('B')
         if 'Contents' in self.attrs: