diff --git a/emscripten/buildToolkit b/emscripten/buildToolkit
index 5ab3be25219..3a2f1304d96 100755
--- a/emscripten/buildToolkit
+++ b/emscripten/buildToolkit
@@ -122,6 +122,7 @@ if ($wasmQ) {
 	$LFLAGS = " -s WASM=1";
 	$LFLAGS .= " -s INITIAL_MEMORY=512MB";
 	$LFLAGS .= " -s STACK_SIZE=256MB";
+	$LFLAGS .= " -s ALLOW_MEMORY_GROWTH";
 	$LFLAGS .= " -s SINGLE_FILE=1";
 	$LFLAGS .= " -s INCOMING_MODULE_JS_API=onRuntimeInitialized";
 	if ($debug) {