diff --git a/tests/scripts/test_psa_constant_names.py b/tests/scripts/test_psa_constant_names.py
index de0d014..7f7076c 100755
--- a/tests/scripts/test_psa_constant_names.py
+++ b/tests/scripts/test_psa_constant_names.py
@@ -206,13 +206,16 @@
     c_name = None
     exe_name = None
     try:
-        c_fd, c_name = tempfile.mkstemp(suffix='.c',
+        c_fd, c_name = tempfile.mkstemp(prefix='tmp-{}-'.format(type),
+                                        suffix='.c',
                                         dir='programs/psa')
         exe_suffix = '.exe' if platform.system() == 'Windows' else ''
         exe_name = c_name[:-2] + exe_suffix
         remove_file_if_exists(exe_name)
         c_file = os.fdopen(c_fd, 'w', encoding='ascii')
-        c_file.write('''/* Generated by test_psa_constant_names.py */
+        c_file.write('/* Generated by test_psa_constant_names.py for {} values */'
+                     .format(type))
+        c_file.write('''
 #include <stdio.h>
 #include <psa/crypto.h>
 int main(void)