diff --git a/jssrc/term_screen.js b/jssrc/term_screen.js
index 4310899..e761277 100644
--- a/jssrc/term_screen.js
+++ b/jssrc/term_screen.js
@@ -994,7 +994,7 @@ class TermScreen {
       this.screenAttrs = new Array(screenLength).fill(' ')
     }
 
-    let strArray = undef(Array.from) ? Array.from(str) : str.split('')
+    let strArray = !undef(Array.from) ? Array.from(str) : str.split('')
 
     const MASK_LINE_ATTR = 0xC8
     const MASK_BLINK = 1 << 4