diff --git a/src/std/filters/test/dbndTest.c b/src/std/filters/test/dbndTest.c
index b35b9a6cc..dc0c3e20e 100644
--- a/src/std/filters/test/dbndTest.c
+++ b/src/std/filters/test/dbndTest.c
@@ -62,6 +62,7 @@ static void changeValue(db_field_log *pfl2, long val) {
 }
 
 static void mustPassOnce(dbChannel *pch, db_field_log *pfl2, char* m, double d, long val) {
+    int oldFree = db_available_logs(), newFree;
     db_field_log *pfl;
 
     changeValue(pfl2, val);
@@ -71,18 +72,26 @@ static void mustPassOnce(dbChannel *pch, db_field_log *pfl2, char* m, double d,
     testOk(fl_equal(pfl, pfl2), "call 1 does not change field_log data");
     pfl = dbChannelRunPreChain(pch, pfl2);
     testOk(NULL == pfl, "call 2 drops field_log");
+    newFree = db_available_logs();
+    testOk(newFree == oldFree + 1, "field_log was freed - %d+1 => %d",
+        oldFree, newFree);
 }
 
 static void mustDrop(dbChannel *pch, db_field_log *pfl2, char* m, double d, long val) {
+    int oldFree = db_available_logs(), newFree;
     db_field_log *pfl;
 
     changeValue(pfl2, val);
     testDiag("mode=%s delta=%g filter must drop", m, d);
     pfl = dbChannelRunPreChain(pch, pfl2);
     testOk(NULL == pfl, "call 1 drops field_log");
+    newFree = db_available_logs();
+    testOk(newFree == oldFree + 1, "field_log was freed - %d+1 => %d",
+        oldFree, newFree);
 }
 
 static void mustPassTwice(dbChannel *pch, db_field_log *pfl2, char* m, double d, long val) {
+    int oldFree = db_available_logs(), newFree;
     db_field_log *pfl;
 
     changeValue(pfl2, val);
@@ -93,6 +102,9 @@ static void mustPassTwice(dbChannel *pch, db_field_log *pfl2, char* m, double d,
     pfl = dbChannelRunPreChain(pch, pfl2);
     testOk(pfl2 == pfl, "call 2 does not drop or replace field_log");
     testOk(fl_equal(pfl, pfl2), "call 2 does not change field_log data");
+    newFree = db_available_logs();
+    testOk(newFree == oldFree, "field_log was not freed - %d => %d",
+        oldFree, newFree);
 }
 
 static void testHead (char* title) {
@@ -113,8 +125,9 @@ MAIN(dbndTest)
     db_field_log *pfl2;
     db_field_log fl1;
     dbEventCtx evtctx;
+    int logsFree, logsFinal;
 
-    testPlan(59);
+    testPlan(77);
 
     testdbPrepare();
 
@@ -135,6 +148,11 @@ MAIN(dbndTest)
     testOk(!!(pch = dbChannelCreate("x.VAL{\"dbnd\":{}}")), "dbChannel with plugin dbnd (delta=0) created");
     testOk((ellCount(&pch->filters) == 1), "channel has one plugin");
 
+    /* Start the free-list */
+    db_delete_field_log(db_create_read_log(pch));
+    logsFree = db_available_logs();
+    testDiag("%d field_logs on free-list", logsFree);
+
     memset(&fl, PATTERN, sizeof(fl));
     fl1 = fl;
     node = ellFirst(&pch->filters);
@@ -176,6 +194,8 @@ MAIN(dbndTest)
 
     dbChannelDelete(pch);
 
+    testDiag("%d field_logs on free-list", db_available_logs());
+
     /* Delta = -1: pass any update */
 
     testHead("Delta = -1: pass any update");
@@ -192,6 +212,8 @@ MAIN(dbndTest)
     db_delete_field_log(pfl2);
     dbChannelDelete(pch);
 
+    testDiag("%d field_logs on free-list", db_available_logs());
+
     /* Delta = absolute */
 
     testHead("Delta = absolute");
@@ -224,6 +246,8 @@ MAIN(dbndTest)
 
     dbChannelDelete(pch);
 
+    testDiag("%d field_logs on free-list", db_available_logs());
+
     /* Delta = relative */
 
     testHead("Delta = relative");
@@ -275,6 +299,9 @@ MAIN(dbndTest)
 
     dbChannelDelete(pch);
 
+    logsFinal = db_available_logs();
+    testOk(logsFree == logsFinal, "%d field_logs on free-list", logsFinal);
+
     db_close_events(evtctx);
 
     testIocShutdownOk();