diff --git a/leios-sim/index.html b/leios-sim/index.html
index babbf8f4..959fbc75 100644
--- a/leios-sim/index.html
+++ b/leios-sim/index.html
@@ -36,7 +36,7 @@
 
       <div class="col-md-3">
 	<label for="input_f_I" class="form-label">$$f_I$$</label>
-	<input type="number" min="1" max="5" class="form-control" id="input_F_I">
+	<input type="number" min="1" max="5" class="form-control" id="input_f_I">
       </div>
 
       <div class="col-md-3">