diff --git a/soc/xtensa/intel_apl_adsp/common/bootloader/CMakeLists.txt b/soc/xtensa/intel_apl_adsp/common/bootloader/CMakeLists.txt
index 674e2f621f5..8d0f85a2721 100644
--- a/soc/xtensa/intel_apl_adsp/common/bootloader/CMakeLists.txt
+++ b/soc/xtensa/intel_apl_adsp/common/bootloader/CMakeLists.txt
@@ -23,7 +23,7 @@ add_executable(bootloader
 
 add_dependencies(bootloader ${SYSCALL_LIST_H_TARGET})
 
-set(zephyr_sdk $ENV{ZEPHYR_SDK_INSTALL_DIR})
+set(zephyr_sdk ${ZEPHYR_SDK_INSTALL_DIR})
 
 target_include_directories(bootloader PUBLIC
   ./