diff --git a/lib/cpp/src/protocol/TCompactProtocol.h b/lib/cpp/src/protocol/TCompactProtocol.h
index 19a0160..c4d1f08 100644
--- a/lib/cpp/src/protocol/TCompactProtocol.h
+++ b/lib/cpp/src/protocol/TCompactProtocol.h
@@ -35,10 +35,10 @@
   : public TVirtualProtocol< TCompactProtocolT<Transport_> > {
 
  protected:
-  static const int8_t  PROTOCOL_ID = 0x82;
+  static const int8_t  PROTOCOL_ID = (int8_t)0x82;
   static const int8_t  VERSION_N = 1;
   static const int8_t  VERSION_MASK = 0x1f; // 0001 1111
-  static const int8_t  TYPE_MASK = 0xE0; // 1110 0000
+  static const int8_t  TYPE_MASK = (int8_t)0xE0; // 1110 0000
   static const int32_t TYPE_SHIFT_AMOUNT = 5;
 
   Transport_* trans_;
diff --git a/lib/cpp/test/Benchmark.cpp b/lib/cpp/test/Benchmark.cpp
index a9859d8..f4cd392 100644
--- a/lib/cpp/test/Benchmark.cpp
+++ b/lib/cpp/test/Benchmark.cpp
@@ -56,7 +56,7 @@
   OneOfEach ooe;
   ooe.im_true   = true;
   ooe.im_false  = false;
-  ooe.a_bite    = 0xd6;
+  ooe.a_bite    = 0x7f;
   ooe.integer16 = 27000;
   ooe.integer32 = 1<<24;
   ooe.integer64 = (uint64_t)6000 * 1000 * 1000;
diff --git a/lib/cpp/test/DebugProtoTest.cpp b/lib/cpp/test/DebugProtoTest.cpp
index ed23d1a..4f456f3 100644
--- a/lib/cpp/test/DebugProtoTest.cpp
+++ b/lib/cpp/test/DebugProtoTest.cpp
@@ -31,7 +31,7 @@
   OneOfEach ooe;
   ooe.im_true   = true;
   ooe.im_false  = false;
-  ooe.a_bite    = 0xd6;
+  ooe.a_bite    = 0x7f;
   ooe.integer16 = 27000;
   ooe.integer32 = 1<<24;
   ooe.integer64 = (uint64_t)6000 * 1000 * 1000;
diff --git a/lib/cpp/test/JSONProtoTest.cpp b/lib/cpp/test/JSONProtoTest.cpp
index 2479638..a9268a2 100644
--- a/lib/cpp/test/JSONProtoTest.cpp
+++ b/lib/cpp/test/JSONProtoTest.cpp
@@ -33,7 +33,7 @@
   OneOfEach ooe;
   ooe.im_true   = true;
   ooe.im_false  = false;
-  ooe.a_bite    = 0xd6;
+  ooe.a_bite    = 0x7f;
   ooe.integer16 = 27000;
   ooe.integer32 = 1<<24;
   ooe.integer64 = (uint64_t)6000 * 1000 * 1000;
@@ -123,7 +123,7 @@
 
   assert(hm == hm2);
 
-  hm2.big[0].a_bite = 0xFF;
+  hm2.big[0].a_bite = 0x00;
 
   assert(hm != hm2);
 
diff --git a/lib/cpp/test/SpecializationTest.cpp b/lib/cpp/test/SpecializationTest.cpp
index 954585a..fae1d32 100644
--- a/lib/cpp/test/SpecializationTest.cpp
+++ b/lib/cpp/test/SpecializationTest.cpp
@@ -18,7 +18,7 @@
   OneOfEach ooe;
   ooe.im_true   = true;
   ooe.im_false  = false;
-  ooe.a_bite    = 0xd6;
+  ooe.a_bite    = 0x7f;
   ooe.integer16 = 27000;
   ooe.integer32 = 1<<24;
   ooe.integer64 = (uint64_t)6000 * 1000 * 1000;
@@ -100,7 +100,7 @@
 
   assert(hm == hm2);
 
-  hm2.big[0].a_bite = 0xFF;
+  hm2.big[0].a_bite = 0x00;
 
   assert(hm != hm2);