diff --git a/tests/libtest/lib1506.c b/tests/libtest/lib1506.c
index ca1cdc96ff3a4e6e2168f9c4ac92ca6f81004be6..b61c4db796855c8b01b462cb6584b8eabeecb55a 100644
--- a/tests/libtest/lib1506.c
+++ b/tests/libtest/lib1506.c
@@ -114,6 +114,7 @@ int test(char *URL)
 
       abort_on_test_timeout();
     }
+    wait_ms(1); /* to ensure different end times */
   }
 
 test_cleanup: