diff --git a/samples/application_development/code_relocation_nocopy/linker_arm_nocopy.ld b/samples/application_development/code_relocation_nocopy/linker_arm_nocopy.ld
index 0a11783cca2..5e69fabab0d 100644
--- a/samples/application_development/code_relocation_nocopy/linker_arm_nocopy.ld
+++ b/samples/application_development/code_relocation_nocopy/linker_arm_nocopy.ld
@@ -31,21 +31,21 @@
 
 #define EXTFLASH_NODE	DT_INST(0, st_stm32_ospi_nor)
 #define EXTFLASH_ADDR	DT_REG_ADDR(DT_INST(0, st_stm32_ospi_nor))
-#define EXTFLASH_SIZE	DT_REG_ADDR_BY_IDX(DT_INST(0, st_stm32_ospi_nor), 1)
+#define EXTFLASH_SIZE	DT_REG_SIZE(DT_INST(0, st_stm32_ospi_nor))
 
 #elif defined(CONFIG_STM32_MEMMAP) && DT_NODE_EXISTS(DT_INST(0, st_stm32_qspi_nor))
 /* On stm32 QSPI, external flash is mapped in XIP region at address given by the reg property. */
 
 #define EXTFLASH_NODE	DT_INST(0, st_stm32_qspi_nor)
 #define EXTFLASH_ADDR	DT_REG_ADDR(DT_INST(0, st_stm32_qspi_nor))
-#define EXTFLASH_SIZE	DT_REG_ADDR_BY_IDX(DT_INST(0, st_stm32_qspi_nor), 1)
+#define EXTFLASH_SIZE	DT_REG_SIZE(DT_INST(0, st_stm32_ospi_nor))
 
 #elif defined(CONFIG_STM32_MEMMAP) && DT_NODE_EXISTS(DT_INST(0, st_stm32_xspi_nor))
 /* On stm32 XSPI, external flash is mapped in XIP region at address given by the reg property. */
 
 #define EXTFLASH_NODE	DT_INST(0, st_stm32_xspi_nor)
 #define EXTFLASH_ADDR	DT_REG_ADDR(DT_INST(0, st_stm32_xspi_nor))
-#define EXTFLASH_SIZE	DT_REG_ADDR_BY_IDX(DT_INST(0, st_stm32_xspi_nor), 1)
+#define EXTFLASH_SIZE	DT_REG_SIZE(DT_INST(0, st_stm32_ospi_nor))
 
 #elif defined(CONFIG_FLASH_MSPI_NOR) && defined(CONFIG_SOC_NRF54H20_CPUAPP)