diff --git a/rialto/src/main.rs b/rialto/src/main.rs
index 025edff..11e67cb 100644
--- a/rialto/src/main.rs
+++ b/rialto/src/main.rs
@@ -234,4 +234,4 @@
 }
 
 main!(main);
-configure_heap!(SIZE_128KB);
+configure_heap!(SIZE_128KB * 2);