diff --git a/lib/lines-adapter.js b/lib/lines-adapter.js
index 7968133..79adb0f 100644
--- a/lib/lines-adapter.js
+++ b/lib/lines-adapter.js
@@ -24,7 +24,7 @@ function Lines(stream, encoding)
 	    }
 	);
 
-    for (prop in stream) {
+    for (var prop in stream) {
 	if (this[prop]) {
 	    continue;
 	}