[2371] cleanup: removed now-unnecessary include

diff --git a/src/lib/dns/master_lexer.cc b/src/lib/dns/master_lexer.cc
index 6197a9c992be53031724f73a3851d261058b12f5..c9c55289951835f628a4bbd67d5eed61aa466a22 100644 (file)
--- a/src/lib/dns/master_lexer.cc
+++ b/src/lib/dns/master_lexer.cc
@@ -21,7 +21,6 @@
 
 #include <cassert>
 #include <string>
-#include <sstream>
 #include <vector>
 
 namespace isc {