diff --git a/src/library_ccall.js b/src/library_ccall.js
index d9cae71501faa..09022e9c6c819 100644
--- a/src/library_ccall.js
+++ b/src/library_ccall.js
@@ -32,7 +32,6 @@ addToLibrary({
       'string': (str) => {
         var ret = 0;
         if (str !== null && str !== undefined && str !== 0) { // null string
-          // at most 4 bytes per UTF-8 code point, +1 for the trailing '\0'
           ret = stringToUTF8OnStack(str);
         }
         return {{{ to64('ret') }}};