diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7dc2af0af..31ba6a2d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -125,7 +125,7 @@ if(EMSCRIPTEN)
     add_link_options(-sMALLOC=mimalloc)
     # The default stack size apparently causes problem when parallelization is
     # enabled.
-    add_link_options(-sSTACK_SIZE=10MB)
+    add_link_options(-sSTACK_SIZE=20MB)
   endif()
   if(MANIFOLD_DEBUG)
     list(APPEND MANIFOLD_FLAGS -fexceptions)