diff --git a/test/plugin.c b/test/plugin.c
index 1254e9a420..3034c0bd6d 100644
--- a/test/plugin.c
+++ b/test/plugin.c
@@ -733,7 +733,10 @@ test_filter_path_apis(void)
 
     if(H5Zfilter_avail(H5Z_FILTER_DYNLIB1) != TRUE) TEST_ERROR
 
+    TESTING("    initialize");
     H5PLsize(&ndx);
+    if(ndx!=2) TEST_ERROR
+    PASSED();
 
     TESTING("    remove");
     /* Remove all existing paths*/