diff --git a/hw/bsp/rx/boards/rx65n_target/r5f565ne.ld b/hw/bsp/rx/boards/rx65n_target/r5f565ne.ld
index 8e5617f2..27914e64 100644
--- a/hw/bsp/rx/boards/rx65n_target/r5f565ne.ld
+++ b/hw/bsp/rx/boards/rx65n_target/r5f565ne.ld
@@ -1,5 +1,5 @@
-__USTACK_SIZE = 0x00000400;
-__ISTACK_SIZE = 0x00000400;
+__USTACK_SIZE = 0x00000800;
+__ISTACK_SIZE = 0x00000800;
 
 MEMORY
 {