diff --git a/arch/nios2/soc/nios2f-zephyr/CMakeLists.txt b/arch/nios2/soc/nios2f-zephyr/CMakeLists.txt
index 92d5edf45a9..e69de29bb2d 100644
--- a/arch/nios2/soc/nios2f-zephyr/CMakeLists.txt
+++ b/arch/nios2/soc/nios2f-zephyr/CMakeLists.txt
@@ -1,2 +0,0 @@
-
-set($ENV{NIOS2_CPU_SOF} $ENV{ZEPHYR_BASE}/arch/nios2/soc/nios2f-zephyr/cpu/ghrd_10m50da.sof)
diff --git a/boards/nios2/altera_max10/board.cmake b/boards/nios2/altera_max10/board.cmake
index ba1aef2513d..46e36a3c8b1 100644
--- a/boards/nios2/altera_max10/board.cmake
+++ b/boards/nios2/altera_max10/board.cmake
@@ -1,2 +1,4 @@
 set(FLASH_SCRIPT nios2.sh)
 set(DEBUG_SCRIPT nios2.sh)
+set(NIOS2_CPU_SOF $ENV{ZEPHYR_BASE}/arch/nios2/soc/nios2f-zephyr/cpu/ghrd_10m50da.sof)
+set_property(GLOBAL APPEND PROPERTY FLASH_SCRIPT_ENV_VARS NIOS2_CPU_SOF)