diff --git a/rtos/TARGET_CORTEX/rtx5/RTX/Source/TOOLCHAIN_GCC/TARGET_M33/irq_armv8mml.S b/rtos/TARGET_CORTEX/rtx5/RTX/Source/TOOLCHAIN_GCC/TARGET_M33/irq_armv8mml.S
index 12062b6e19..3cbab2ad8b 100644
--- a/rtos/TARGET_CORTEX/rtx5/RTX/Source/TOOLCHAIN_GCC/TARGET_M33/irq_armv8mml.S
+++ b/rtos/TARGET_CORTEX/rtx5/RTX/Source/TOOLCHAIN_GCC/TARGET_M33/irq_armv8mml.S
@@ -27,7 +27,7 @@
         .file    "irq_armv8mml.S"
         .syntax  unified
 
-+#ifndef __DOMAIN_NS
+#ifndef __DOMAIN_NS
         .equ     __DOMAIN_NS, 0
 #endif