diff --git a/buffer/__init__.py b/buffer/__init__.py
index 1094121..52e0349 100644
--- a/buffer/__init__.py
+++ b/buffer/__init__.py
@@ -784,7 +784,7 @@ class Binary32Buffer(FileBuffer):
             while j < self.numgroups * self.groupsize and i + j < len(data):
                 bytes = []
                 for c in data[i + j:i + j + self.groupsize]:
-                    bytes.append(string.hexdigits[ord(c) / 16] + string.hexdigits[ord(c) % 16])
+                    bytes.append(string.hexdigits[c // 16] + string.hexdigits[c % 16])
                 groups.append(bytepad.join(bytes))
                 j += self.groupsize
             lines.append(grouppad.join(groups))