diff --git a/tfm_ci_pylib/tfm_build_manager.py b/tfm_ci_pylib/tfm_build_manager.py
index 7073f18..44b4d58 100644
--- a/tfm_ci_pylib/tfm_build_manager.py
+++ b/tfm_ci_pylib/tfm_build_manager.py
@@ -401,7 +401,9 @@
                             "profile": "" if i.profile=="N.A" else i.profile,
                             "partition_ps": i.partition_ps}
         if i.test_psa_api == "IPC":
-            overwrite_params["test_psa_api"] = i.test_psa_api + " -DINCLUDE_PANIC_TESTS=1 "
+            overwrite_params["test_psa_api"] += " -DINCLUDE_PANIC_TESTS=1"
+            if i.tfm_platform == "musca_b1":
+                overwrite_params["test_psa_api"] += " -DITS_RAM_FS=ON -DPS_RAM_FS=ON"
         build_cfg["config_template"] %= overwrite_params
         if len(build_cfg["build_cmds"]) > 1:
             overwrite_build_dir = {"_tbm_build_dir_": build_dir}