diff --git a/src/devtools/views/utils.js b/src/devtools/views/utils.js
index c04f8bddd1..882a1a0ee2 100644
--- a/src/devtools/views/utils.js
+++ b/src/devtools/views/utils.js
@@ -177,7 +177,7 @@ export function truncateText(text: string, maxLength: number): string {
     return (
       text.substr(0, Math.floor(maxLength / 2)) +
       '…' +
-      text.substr(length - Math.ceil(maxLength / 2) + 1)
+      text.substr(length - Math.ceil(maxLength / 2) - 1)
     );
   } else {
     return text;