diff --git a/examples/whisper.wasm/index-tmpl.html b/examples/whisper.wasm/index-tmpl.html
index 711df3f3..9362d44c 100644
--- a/examples/whisper.wasm/index-tmpl.html
+++ b/examples/whisper.wasm/index-tmpl.html
@@ -614,7 +614,7 @@
             var nthreads = 8;
 
             function changeThreads(value) {
-                nthreads = value;
+                nthreads = parseInt(value, 10);
                 document.getElementById('threads-value').innerHTML = nthreads;
             }