diff --git a/src/includes/class/class.LSlang.php b/src/includes/class/class.LSlang.php
index fc4106b4..57e03a83 100644
--- a/src/includes/class/class.LSlang.php
+++ b/src/includes/class/class.LSlang.php
@@ -377,6 +377,15 @@ function _cli_add_str_to_translate($msg, $context=null) {
   if (!is_null($lang) && _($msg) != "$msg")
     return;
 
+  // It is a LSformat string with a simple substitution (for instance: "%{test}")?
+  if (preg_match("/^%[{(][^{(]+[})]$/", $msg)) {
+    $LSlang_cli_logger -> trace(
+      "_cli_add_str_to_translate($msg, $context): LSformat string with a simple substitution, ".
+      "ignore it"
+    );
+    return;
+  }
+
   // Message already exists ?
   if (array_key_exists($msg, $data)) {
     if ($context && !in_array($context, $data[$msg]['contexts']))