diff --git a/tests/tests.cpp b/tests/tests.cpp
index c98d6173..01e22dc4 100644
--- a/tests/tests.cpp
+++ b/tests/tests.cpp
@@ -335,8 +335,8 @@ test_mknod_ff()
   umask(0);
   rv = mknod(ugid,branches,"c/d/fifo",S_IFIFO|0777,0,0);
   TEST_CHECK(rv == 0);
-
-
+  rv = mknod(ugid,branches,"c/d/fifo",S_IFIFO|0777,0,0);
+  TEST_CHECK(rv == -EEXIST);
 }
 
 TEST_LIST =