diff --git a/src/messages/layouts/MessageLayoutElement.cpp b/src/messages/layouts/MessageLayoutElement.cpp
index 50b8126df..0031348d6 100644
--- a/src/messages/layouts/MessageLayoutElement.cpp
+++ b/src/messages/layouts/MessageLayoutElement.cpp
@@ -516,7 +516,8 @@ int TextLayoutElement::getXFromIndex(size_t index)
         int x = 0;
         for (size_t i = 0; i < index; i++)
         {
-            x += metrics.horizontalAdvance(this->getText()[i]);
+            x += metrics.horizontalAdvance(
+                this->getText()[static_cast<QString::size_type>(i)]);
         }
         return x + this->getRect().left();
     }