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) {}