diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index 0a50497..33bd910 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -3129,7 +3129,7 @@ namespace pugi
 
 		for (; *str;)
 		{
-			unsigned int ch;
+			unsigned int ch = 0;
 			str = strutf8_utf16(str, ch);
 			result += (wchar_t)ch;
 		}
diff --git a/src/pugixpath.cpp b/src/pugixpath.cpp
index 41d7de9..b7efa46 100644
--- a/src/pugixpath.cpp
+++ b/src/pugixpath.cpp
@@ -534,6 +534,10 @@ namespace pugi
 
 	class xpath_allocator
 	{
+		// disable copy ctor and assignment
+		xpath_allocator(const xpath_allocator&);
+		xpath_allocator& operator=(const xpath_allocator&);
+
 		struct memory_block
 		{	
 			memory_block(): next(0), size(0)
@@ -841,6 +845,10 @@ namespace pugi
 
 	class xpath_lexer
 	{
+		// disable copy ctor and assignment
+		xpath_lexer(const xpath_lexer&);
+		xpath_lexer& operator=(const xpath_lexer&);
+
 	private:
 		const char* m_cur;