diff --git a/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_GR_LYCHEE/device/TOOLCHAIN_ARM_STD/sys.cpp b/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_GR_LYCHEE/device/TOOLCHAIN_ARM_STD/sys.cpp
index c2dbbe14ea..57a6cc92df 100644
--- a/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_GR_LYCHEE/device/TOOLCHAIN_ARM_STD/sys.cpp
+++ b/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_GR_LYCHEE/device/TOOLCHAIN_ARM_STD/sys.cpp
@@ -51,7 +51,7 @@ extern __value_in_regs struct __initial_stackheap _mbed_user_setup_stackheap(uin
     return r;
 }
 
-#if !defined(MBED_CONF_RTOS_PRESENT) || !MBED_CONF_RTOS_PRESENT
+#ifndef MBED_CONF_RTOS_PRESENT
 
 /* The single region memory model would check stack collision at run time, verifying that
  * the heap pointer is underneath the stack pointer. With two-region memory model/RTOS-less or
diff --git a/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_RZ_A1H/device/TOOLCHAIN_ARM_STD/sys.cpp b/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_RZ_A1H/device/TOOLCHAIN_ARM_STD/sys.cpp
index c2dbbe14ea..57a6cc92df 100644
--- a/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_RZ_A1H/device/TOOLCHAIN_ARM_STD/sys.cpp
+++ b/targets/TARGET_RENESAS/TARGET_RZ_A1XX/TARGET_RZ_A1H/device/TOOLCHAIN_ARM_STD/sys.cpp
@@ -51,7 +51,7 @@ extern __value_in_regs struct __initial_stackheap _mbed_user_setup_stackheap(uin
     return r;
 }
 
-#if !defined(MBED_CONF_RTOS_PRESENT) || !MBED_CONF_RTOS_PRESENT
+#ifndef MBED_CONF_RTOS_PRESENT
 
 /* The single region memory model would check stack collision at run time, verifying that
  * the heap pointer is underneath the stack pointer. With two-region memory model/RTOS-less or