diff --git a/lib/cpp/src/protocol/TBinaryProtocol.cpp b/lib/cpp/src/protocol/TBinaryProtocol.cpp
index 958572d..544ef88 100644
--- a/lib/cpp/src/protocol/TBinaryProtocol.cpp
+++ b/lib/cpp/src/protocol/TBinaryProtocol.cpp
@@ -10,9 +10,9 @@
 
 namespace facebook { namespace thrift { namespace protocol { 
 
-uint32_t TBinaryProtocol::writeMessageBegin(const std::string name,
-					    const TMessageType messageType,
-					    const int32_t seqid) {
+uint32_t TBinaryProtocol::writeMessageBegin(const std::string& name,
+                                            const TMessageType messageType,
+                                            const int32_t seqid) {
   return 
     writeString(name) + 
     writeByte((int8_t)messageType) +
diff --git a/lib/cpp/src/protocol/TBinaryProtocol.h b/lib/cpp/src/protocol/TBinaryProtocol.h
index 6a85491..89220e2 100644
--- a/lib/cpp/src/protocol/TBinaryProtocol.h
+++ b/lib/cpp/src/protocol/TBinaryProtocol.h
@@ -56,9 +56,9 @@
    * Writing functions.
    */
 
-  virtual uint32_t writeMessageBegin(const std::string name,
-				     const TMessageType messageType,
-				     const int32_t seqid);
+  virtual uint32_t writeMessageBegin(const std::string& name,
+                                     const TMessageType messageType,
+                                     const int32_t seqid);
 
   virtual uint32_t writeMessageEnd();
 
diff --git a/lib/cpp/src/protocol/TProtocol.h b/lib/cpp/src/protocol/TProtocol.h
index 735268e..6264bb6 100644
--- a/lib/cpp/src/protocol/TProtocol.h
+++ b/lib/cpp/src/protocol/TProtocol.h
@@ -88,9 +88,9 @@
    * Writing functions.
    */
 
-  virtual uint32_t writeMessageBegin(const std::string name,
-				     const TMessageType messageType,
-				     const int32_t seqid) = 0;
+  virtual uint32_t writeMessageBegin(const std::string& name,
+                                     const TMessageType messageType,
+                                     const int32_t seqid) = 0;
 
   virtual uint32_t writeMessageEnd() = 0;
 
diff --git a/lib/cpp/src/protocol/TProtocolException.h b/lib/cpp/src/protocol/TProtocolException.h
index ba2fbfb..8f939c6 100644
--- a/lib/cpp/src/protocol/TProtocolException.h
+++ b/lib/cpp/src/protocol/TProtocolException.h
@@ -42,11 +42,11 @@
     facebook::thrift::TException(), 
     type_(type) {}
 
-  TProtocolException(const std::string message) :
+  TProtocolException(const std::string& message) :
     facebook::thrift::TException(message),
     type_(UNKNOWN) {}
 
-  TProtocolException(TProtocolExceptionType type, const std::string message) :
+  TProtocolException(TProtocolExceptionType type, const std::string& message) :
     facebook::thrift::TException(message),
     type_(type) {}