diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23fbf32..f4c446e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -68,7 +68,7 @@ elseif (EMSCRIPTEN)
     -sNO_EXIT_RUNTIME=1
     "-sASYNCIFY_ADD=NACT::execute()"
     -sEXPORTED_FUNCTIONS=_main,_malloc
-    -sEXPORTED_RUNTIME_METHODS=FS,IDBFS,getValue,addRunDependency,removeRunDependency,stringToUTF8OnStack
+    -sEXPORTED_RUNTIME_METHODS=FS,IDBFS,HEAPU8,HEAP16,getValue,addRunDependency,removeRunDependency,stringToUTF8OnStack
     --emit-tsd=system3.d.ts
     )