diff --git a/src/line-by-line-printer.js b/src/line-by-line-printer.js
index b3ce177..834f20c 100644
--- a/src/line-by-line-printer.js
+++ b/src/line-by-line-printer.js
@@ -123,7 +123,7 @@
         var escapedLine = utils.escape(line.content);
 
         if ( line.type !== diffParser.LINE_TYPE.INSERTS &&
-            (newLines.length > 0 || (line.type !== diffParser.LINE_TYPE.DELETES && oldLines > 0))) {
+            (newLines.length > 0 || (line.type !== diffParser.LINE_TYPE.DELETES && oldLines.length > 0))) {
           processChangeBlock();
         }
         if (line.type == diffParser.LINE_TYPE.CONTEXT) {
diff --git a/src/side-by-side-printer.js b/src/side-by-side-printer.js
index a4fafd5..22b55c8 100644
--- a/src/side-by-side-printer.js
+++ b/src/side-by-side-printer.js
@@ -148,7 +148,7 @@
         var escapedLine = utils.escape(line.content.substr(1));
 
         if ( line.type !== diffParser.LINE_TYPE.INSERTS &&
-            (newLines.length > 0 || (line.type !== diffParser.LINE_TYPE.DELETES && oldLines > 0))) {
+            (newLines.length > 0 || (line.type !== diffParser.LINE_TYPE.DELETES && oldLines.length > 0))) {
           processChangeBlock();
         }
         if (line.type == diffParser.LINE_TYPE.CONTEXT) {