diff --git a/kernel/power/dtrsm_kernel_LT_16x4_power8.S b/kernel/power/dtrsm_kernel_LT_16x4_power8.S
index 8a423f181..5b349db12 100644
--- a/kernel/power/dtrsm_kernel_LT_16x4_power8.S
+++ b/kernel/power/dtrsm_kernel_LT_16x4_power8.S
@@ -47,7 +47,6 @@
 #endif
 
 #ifdef __64BIT__
-#define STACKSIZE 320
 #define STACKSIZE 520
 #define ALPHA   296+200(SP)
 #define FZERO	304+200(SP)