diff --git a/interface/CMakeLists.txt b/interface/CMakeLists.txt
index bc216b8..ec7f2d1 100644
--- a/interface/CMakeLists.txt
+++ b/interface/CMakeLists.txt
@@ -10,8 +10,10 @@
 cmake_policy(SET CMP0079 NEW)
 
 # Generate framework feature
+set(PSA_FRAMEWORK_ISOLATION_LEVEL   ${TFM_ISOLATION_LEVEL})
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/include/psa/framework_feature.h.in
-               ${CMAKE_BINARY_DIR}/generated/interface/include/psa/framework_feature.h)
+               ${CMAKE_BINARY_DIR}/generated/interface/include/psa/framework_feature.h
+               @ONLY)
 
 if (TFM_MULTI_CORE_TOPOLOGY)
     include(${CMAKE_SOURCE_DIR}/platform/ext/target/${TFM_PLATFORM}/preload_ns.cmake)
diff --git a/interface/include/psa/framework_feature.h.in b/interface/include/psa/framework_feature.h.in
index 7ac73a6..606c406 100644
--- a/interface/include/psa/framework_feature.h.in
+++ b/interface/include/psa/framework_feature.h.in
@@ -8,7 +8,7 @@
 #ifndef __PSA_FRAMEWORK_FEATURE_H__
 #define __PSA_FRAMEWORK_FEATURE_H__
 
-#cmakedefine PSA_FRAMEWORK_ISOLATION_LEVEL  ${TFM_ISOLATION_LEVEL}
+#cmakedefine PSA_FRAMEWORK_ISOLATION_LEVEL  @PSA_FRAMEWORK_ISOLATION_LEVEL@
 #cmakedefine01 PSA_FRAMEWORK_HAS_MM_IOVEC
 
 #endif /* __PSA_FRAMEWORK_FEATURE_H__ */