diff --git a/ports/webassembly/library.js b/ports/webassembly/library.js
index 27078e504f..6d9b07cfff 100644
--- a/ports/webassembly/library.js
+++ b/ports/webassembly/library.js
@@ -33,10 +33,9 @@ mergeInto(LibraryManager.library, {
                 process.stdout.write(b);
             } else {
                 var c = String.fromCharCode(getValue(ptr + i, 'i8'));
-                var mp_js_stdout = document.getElementById('mp_js_stdout');
-                var print = new Event('print');
-                print.data = c;
-                mp_js_stdout.dispatchEvent(print);
+                var printEvent = new CustomEvent('micropython-print');
+                printEvent.data = c;
+                document.dispatchEvent(printEvent);
             }
         }
     },