diff --git a/build_helper/build_helper_configs.py b/build_helper/build_helper_configs.py
index 2453e73..5e762f9 100755
--- a/build_helper/build_helper_configs.py
+++ b/build_helper/build_helper_configs.py
@@ -62,7 +62,7 @@
         "-DPSA_ARCH_TESTS_PATH=%(codebase_root_dir)s/../psa-arch-tests " + \
         "-DMCUBOOT_PATH=%(codebase_root_dir)s/../mcuboot " + \
         "-DTFM_PROFILE=%(profile)s " + \
-        "-DTFM_PARTITION_PS=%(partition_ps)s " + \
+        "-DTFM_PARTITION_PROTECTED_STORAGE=%(partition_ps)s " + \
         "%(codebase_root_dir)s",
 
     # A small subset of  string substitution params is allowed in commands.