diff --git a/tools/psa/release.py b/tools/psa/release.py
index 5b5a131422..19ec7b80dd 100644
--- a/tools/psa/release.py
+++ b/tools/psa/release.py
@@ -117,7 +117,7 @@ def build_tfm_platform(target, toolchain):
 
 
 def build_psa_platform(target, toolchain):
-    if _psa_backend(options.mcu) is 'TFM':
+    if _psa_backend(target) is 'TFM':
         build_tfm_platform(target, toolchain)
     else:
         build_mbed_spm_platform(target, toolchain)