diff --git a/src/framework/core/binarytree.cpp b/src/framework/core/binarytree.cpp
index dde520a3..ba1548df 100644
--- a/src/framework/core/binarytree.cpp
+++ b/src/framework/core/binarytree.cpp
@@ -240,11 +240,12 @@ void OutputBinaryTree::endNode()
     m_fin->addU8(BINARYTREE_NODE_END);
 }
 
-void OutputBinaryTree::write(const uint8 *data, int size)
+void OutputBinaryTree::write(const uint8 *data, size_t size)
 {
-    for(int i=0;i<size;++i) {
+    for(size_t i=0;i<size;++i) {
         if(data[i]==BINARYTREE_NODE_START || data[i]==BINARYTREE_NODE_END||data[i]==BINARYTREE_ESCAPE_CHAR)
             m_fin->addU8(BINARYTREE_ESCAPE_CHAR);
         m_fin->addU8(data[i]);
     }
 }
+
diff --git a/src/framework/core/binarytree.h b/src/framework/core/binarytree.h
index 19a42d15..1842205b 100644
--- a/src/framework/core/binarytree.h
+++ b/src/framework/core/binarytree.h
@@ -85,7 +85,7 @@ private:
     FileStreamPtr m_fin;
 
 protected:
-    void write(const uint8* data, int size);
+    void write(const uint8* data, size_t size);
 };
 
 #endif