diff --git a/spine-cpp/spine-cpp/src/spine/Json.cpp b/spine-cpp/spine-cpp/src/spine/Json.cpp
index daf82e490..f654e6b67 100644
--- a/spine-cpp/spine-cpp/src/spine/Json.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Json.cpp
@@ -120,7 +120,7 @@ Json::Json(const char *value) :
 }
 
 Json::~Json() {
-    spine::Json* curr = nullptr;
+    spine::Json* curr = NULL;
     spine::Json* next = _child;
     do {
         curr = next;
diff --git a/spine-cpp/spine-cpp/src/spine/SkeletonBinary.cpp b/spine-cpp/spine-cpp/src/spine/SkeletonBinary.cpp
index fd266ee1b..5ba11f662 100644
--- a/spine-cpp/spine-cpp/src/spine/SkeletonBinary.cpp
+++ b/spine-cpp/spine-cpp/src/spine/SkeletonBinary.cpp
@@ -380,7 +380,7 @@ char *SkeletonBinary::readString(DataInput *input) {
 
 char* SkeletonBinary::readStringRef(DataInput* input, SkeletonData* skeletonData) {
 	int index = readVarint(input, true);
-	return index == 0 ? nullptr : skeletonData->_strings[index - 1];
+	return index == 0 ? NULL : skeletonData->_strings[index - 1];
 }
 
 float SkeletonBinary::readFloat(DataInput *input) {