1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/ConfigParser.py b/Lib/ConfigParser.py
index 73acdd1..fccfcdf 100644
--- a/Lib/ConfigParser.py
+++ b/Lib/ConfigParser.py
@@ -343,6 +343,8 @@ class RawConfigParser:
 
     def set(self, section, option, value):
         """Set an option."""
+        if not isinstance(value, basestring):
+            raise TypeError("option values must be strings")
         if not section or section == DEFAULTSECT:
             sectdict = self._defaults
         else: