diff --git a/.gitignore b/.gitignore
index 0792920..e86092c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,6 +41,9 @@
 # Generated documentation:
 /apidoc
 
+# PSA Crypto compliance test repo, cloned by test_psa_complaince.py
+/psa-arch-tests
+
 # Editor navigation files:
 /GPATH
 /GRTAGS
diff --git a/tests/scripts/test_psa_compliance.py b/tests/scripts/test_psa_compliance.py
index 33207c0..2f67f08 100755
--- a/tests/scripts/test_psa_compliance.py
+++ b/tests/scripts/test_psa_compliance.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 """Run the PSA Cryto API compliance test suite.
 Clone the repo and check out the commit specified by PSA_ARCH_TEST_REPO and PSA_ARCH_TEST_REF,
-then complie and run the test suite.
+then complie and run the test suite. The clone is stored at <Mbed TLS root>/psa-arch-tests.
 Known defects in either the test suite or mbedtls - identified by their test number - are ignored,
 while unexpected failures AND successes are reported as errors,
 to help keep the list of known defects as up to date as possible.
@@ -46,6 +46,7 @@
     try:
         os.chdir(psa_arch_tests_dir)
 
+        # Reuse existing local clone
         subprocess.check_call(['git', 'init'])
         subprocess.check_call(['git', 'fetch', PSA_ARCH_TESTS_REPO, PSA_ARCH_TESTS_REF])
         subprocess.check_call(['git', 'checkout', 'FETCH_HEAD'])
@@ -117,7 +118,6 @@
             print('FAILED')
             return 1
         else:
-            shutil.rmtree(psa_arch_tests_dir)
             print('SUCCESS')
             return 0
     finally: