diff --git a/ChangeLog.d/PSA-test-suites-NOT-using-UID-0.txt b/ChangeLog.d/PSA-test-suites-NOT-using-UID-0.txt
new file mode 100644
index 000000000..9acbb0ad3
--- /dev/null
+++ b/ChangeLog.d/PSA-test-suites-NOT-using-UID-0.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix unit tests that used 0 as the file UID. This failed on some
+     implementations of PSA ITS. Fixes #3838.
diff --git a/tests/suites/test_suite_psa_its.function b/tests/suites/test_suite_psa_its.function
index fb9ce0703..e16c05010 100644
--- a/tests/suites/test_suite_psa_its.function
+++ b/tests/suites/test_suite_psa_its.function
@@ -285,3 +285,16 @@ exit:
     cleanup( );
 }
 /* END_CASE */
+
+/* BEGIN_CASE */
+void set_fail( int uid_arg, data_t *data,
+               int expected_status )
+{
+    psa_storage_uid_t uid = uid_arg;
+    TEST_ASSERT( psa_its_set_wrap( uid, data->len, data->x, 0 ) ==
+                 (psa_status_t) expected_status );
+
+    exit:
+    cleanup( );
+}
+/* END_CASE */