diff --git a/cli/build/main.rs b/cli/build/main.rs
index ee78c2a..9bf63d0 100644
--- a/cli/build/main.rs
+++ b/cli/build/main.rs
@@ -177,9 +177,9 @@ fn do_main() -> Result<(), Error> {
 			module = new_module;
 			let mut stack_top_page = new_stack_top / 65536;
 			if new_stack_top % 65536 > 0 { stack_top_page += 1 };
-			module = externalize_mem(module, Some(stack_top_page), 16);
+			module = externalize_mem(module, Some(stack_top_page), 20);
 		} else {
-			module = externalize_mem(module, None, 16);
+			module = externalize_mem(module, None, 20);
 		}
 	}