diff --git a/lib/parser.js b/lib/parser.js
index 80c4d67..73bb88a 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -170,7 +170,7 @@ Parser.prototype = {
 						if(!name) {
 							name = tagNames.exif[tagType];
 						}
-						if (tags.hasOwnProperty(name)) {
+						if (!tags.hasOwnProperty(name)) {
 							tags[name] = value;
 						}
 					} else {