diff --git a/lib/cpp/src/protocol/TJSONProtocol.cpp b/lib/cpp/src/protocol/TJSONProtocol.cpp
index a7564d1..ca3a51f 100644
--- a/lib/cpp/src/protocol/TJSONProtocol.cpp
+++ b/lib/cpp/src/protocol/TJSONProtocol.cpp
@@ -32,7 +32,7 @@
 
 static const std::string kJSONEscapePrefix("\\u00");
 
-static const uint8_t kThriftVersion1 = 1;
+static const uint32_t kThriftVersion1 = 1;
 
 static const std::string kThriftNan("NaN");
 static const std::string kThriftInfinity("Infinity");