diff --git a/src/Rtmp/amf.cpp b/src/Rtmp/amf.cpp
index a63e491e..89014856 100644
--- a/src/Rtmp/amf.cpp
+++ b/src/Rtmp/amf.cpp
@@ -76,8 +76,8 @@ inline void AMFValue::init() {
 	}
 
 }
-AMFValue::AMFValue() :
-		_type(AMF_NULL) {
+AMFValue::AMFValue(AMFType type) :
+		_type(type) {
 	init();
 }
 
diff --git a/src/Rtmp/amf.h b/src/Rtmp/amf.h
index 7e5ed0ac..ead844d8 100644
--- a/src/Rtmp/amf.h
+++ b/src/Rtmp/amf.h
@@ -55,7 +55,7 @@ public:
     typedef std::map<std::string, AMFValue> mapType;
     typedef std::vector<AMFValue> arrayType;
 
-	AMFValue();
+	AMFValue(AMFType type = AMF_NULL);
 	AMFValue(const char *s);
 	AMFValue(const std::string &s);
 	AMFValue(double n);