diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index ada8012..4340c2d 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -4688,6 +4688,7 @@ PUGI__NS_BEGIN
 		char_t* buffer = 0;
 		size_t length = 0;
 
+		// coverity[var_deref_model]
 		if (!impl::convert_buffer(buffer, length, buffer_encoding, contents, size, is_mutable)) return impl::make_parse_result(status_out_of_memory);
 
 		// delete original buffer if we performed a conversion
@@ -10083,6 +10084,7 @@ PUGI__NS_BEGIN
 			bool once =
 				(axis == axis_attribute && _test == nodetest_name) ||
 				(!_right && eval_once(axis_type, eval)) ||
+			    // coverity[mixed_enums]
 				(_right && !_right->_next && _right->_test == predicate_constant_one);
 
 			xpath_node_set_raw ns;
@@ -10863,6 +10865,7 @@ PUGI__NS_BEGIN
 			if (_next)
 				_next->optimize(alloc);
 
+			// coverity[var_deref_model]
 			optimize_self(alloc);
 		}
 
@@ -10923,6 +10926,7 @@ PUGI__NS_BEGIN
 			// Use optimized path for @attr = 'value' or @attr = $value
 			if (_type == ast_op_equal &&
 				_left && _right && // workaround for clang static analyzer and Coverity (_left and _right are never null for ast_op_equal)
+                // coverity[mixed_enums]
 				_left->_type == ast_step && _left->_axis == axis_attribute && _left->_test == nodetest_name && !_left->_left && !_left->_right &&
 				(_right->_type == ast_string_constant || (_right->_type == ast_variable && _right->_rettype == xpath_type_string)))
 			{