diff --git a/embuilder.py b/embuilder.py
index e00a4a29f0b0f..7684388a5e844 100755
--- a/embuilder.py
+++ b/embuilder.py
@@ -127,6 +127,8 @@ def main():
                       help='build relocatable objects for suitable for dynamic linking')
   parser.add_argument('--force', action='store_true',
                       help='force rebuild of target (by removing it first)')
+  parser.add_argument('--wasm64', action='store_true',
+                      help='use wasm64 architecture')
   parser.add_argument('operation', help='currently only "build" is supported')
   parser.add_argument('targets', nargs='+', help='see below')
   args = parser.parse_args()
@@ -147,6 +149,9 @@ def main():
   if args.pic:
     settings.RELOCATABLE = 1
 
+  if args.wasm64:
+    settings.MEMORY64 = 2
+
   if args.force:
     force = True