diff --git a/lib/cpp/test/AllProtocolTests.cpp b/lib/cpp/test/AllProtocolTests.cpp
index db29ccc..8fec7f5 100644
--- a/lib/cpp/test/AllProtocolTests.cpp
+++ b/lib/cpp/test/AllProtocolTests.cpp
@@ -31,6 +31,8 @@
 char errorMessage[ERR_LEN];
 
 int main(int argc, char** argv) {
+  (void) argc;
+  (void) argv;
   try {
     testProtocol<TBinaryProtocol>("TBinaryProtocol");
     testProtocol<TCompactProtocol>("TCompactProtocol");
diff --git a/lib/cpp/test/DebugProtoTest_extras.cpp b/lib/cpp/test/DebugProtoTest_extras.cpp
index e68c544..c89db74 100644
--- a/lib/cpp/test/DebugProtoTest_extras.cpp
+++ b/lib/cpp/test/DebugProtoTest_extras.cpp
@@ -25,6 +25,7 @@
 namespace thrift { namespace test { namespace debug {
 
 bool Empty::operator<(Empty const& other) const {
+  (void) other;
   // It is empty, so all are equal.
   return false;
 }
diff --git a/lib/cpp/test/TFileTransportTest.cpp b/lib/cpp/test/TFileTransportTest.cpp
index 98fd18d..6260094 100644
--- a/lib/cpp/test/TFileTransportTest.cpp
+++ b/lib/cpp/test/TFileTransportTest.cpp
@@ -70,6 +70,7 @@
   FsyncLog() {}
 
   void fsync(int fd) {
+    (void) fd;
     FsyncCall call;
     gettimeofday(&call.time, NULL);
     calls_.push_back(call);
diff --git a/lib/cpp/test/TransportTest.cpp b/lib/cpp/test/TransportTest.cpp
index 46a89a7..d12e384 100644
--- a/lib/cpp/test/TransportTest.cpp
+++ b/lib/cpp/test/TransportTest.cpp
@@ -341,6 +341,7 @@
 void set_alarm();
 
 void alarm_handler(int signum) {
+  (void) signum;
   // The alarm timed out, which almost certainly means we're stuck
   // on a transport that is incorrectly blocked.
   ++numTriggersFired;