diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index ececf72f37c..35550ad3641 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -49,6 +49,10 @@ Data members:
 #define DELIM ' '
 #endif
 
+#ifdef MSDOS
+#define DELIM ';'
+#endif
+
 #ifndef DELIM
 #define DELIM ':'
 #endif