diff --git a/src/mongo/db/dbwebserver.cpp b/src/mongo/db/dbwebserver.cpp

index b202e05..0255613 100644

--- a/src/mongo/db/dbwebserver.cpp

+++ b/src/mongo/db/dbwebserver.cpp

@@ -67,6 +67,7 @@ namespace mongo {

 using std::map;

 using std::stringstream;

 using std::vector;

+using std::string;

 using namespace html;

diff --git a/src/mongo/db/matcher/expression_leaf.cpp b/src/mongo/db/matcher/expression_leaf.cpp

index d562bff..b96a36d 100644

--- a/src/mongo/db/matcher/expression_leaf.cpp

+++ b/src/mongo/db/matcher/expression_leaf.cpp

@@ -202,7 +202,7 @@ void ComparisonMatchExpression::debugString(StringBuilder& debug, int level) con

 }

 void ComparisonMatchExpression::serialize(BSONObjBuilder* out) const {

-    string opString = "";

+    std::string opString = "";

     switch (matchType()) {

         case LT:

             opString = "$lt";

@@ -884,7 +884,7 @@ void BitTestMatchExpression::debugString(StringBuilder& debug, int level) const

 }

 void BitTestMatchExpression::serialize(BSONObjBuilder* out) const {

-    string opString = "";

+    std::string opString = "";

     switch (matchType()) {

         case BITS_ALL_SET:

diff --git a/src/mongo/db/repl/master_slave.cpp b/src/mongo/db/repl/master_slave.cpp

index 05faad1..7fbc062 100644

--- a/src/mongo/db/repl/master_slave.cpp

+++ b/src/mongo/db/repl/master_slave.cpp

@@ -81,6 +81,7 @@ using std::set;

 using std::stringstream;

 using std::unique_ptr;

 using std::vector;

+using std::string;

 namespace mongo {

 namespace repl {

diff --git a/src/mongo/shell/bench.cpp b/src/mongo/shell/bench.cpp

index 040002f..cb0f6f4 100644

--- a/src/mongo/shell/bench.cpp

+++ b/src/mongo/shell/bench.cpp

@@ -78,6 +78,7 @@ namespace mongo {

 using std::unique_ptr;

 using std::cout;

 using std::map;

+using std::string;

 const std::map<OpType, std::string> opTypeName{{OpType::NONE, "none"},

                                                {OpType::NOP, "nop"},

diff --git a/src/mongo/util/net/miniwebserver.cpp b/src/mongo/util/net/miniwebserver.cpp

index 5f4165d..7a7d071 100644

--- a/src/mongo/util/net/miniwebserver.cpp

+++ b/src/mongo/util/net/miniwebserver.cpp

@@ -47,6 +47,7 @@ namespace mongo {

 using std::shared_ptr;

 using std::stringstream;

 using std::vector;

+using std::string;

 MiniWebServer::MiniWebServer(const string& name, const string& ip, int port, ServiceContext* ctx)

     : Listener(name, ip, port, ctx, false, false) {}