diff --git a/tools/build.py b/tools/build.py
index a11cd2f56d..40b0a52771 100644
--- a/tools/build.py
+++ b/tools/build.py
@@ -188,7 +188,7 @@ if __name__ == '__main__':
                     mcu = TARGET_MAP[target]
                     profile = extract_profile(parser, options, toolchain)
 
-                    if Target.get_target(mcu).is_PSA_secure_target:
+                    if mcu.is_PSA_secure_target:
                         lib_build_res = build_library(
                             ROOT, options.build_dir, mcu, toolchain,
                             jobs=options.jobs,