diff --git a/Source/CTest/Curl/arpa_telnet.h b/Source/CTest/Curl/arpa_telnet.h
index 2cf0241dd..378b7c013 100644
--- a/Source/CTest/Curl/arpa_telnet.h
+++ b/Source/CTest/Curl/arpa_telnet.h
@@ -60,6 +60,10 @@ static const char *telnetoptions[]=
 
 #define NTELOPTS 40 
 
+#ifdef SE
+# undef SE
+#endif
+
 /*
  * First some defines
  */