diff --git a/CHANGES.txt b/CHANGES.txt
index 0d153434ed..c72bf69c28 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
 1.0.7
+ * avoid logging (harmless) exception when GC takes < 1ms (CASSANDRA-3656)
  * add nodetool setstreamthroughput (CASSANDRA-3571)
  * fix assertion when dropping a columnfamily with no sstables (CASSANDRA-3614)
  * more efficient allocation of small bloom filters (CASSANDRA-3618)
diff --git a/src/java/org/apache/cassandra/service/GCInspector.java b/src/java/org/apache/cassandra/service/GCInspector.java
index 70fd99b440..46357ca1c4 100644
--- a/src/java/org/apache/cassandra/service/GCInspector.java
+++ b/src/java/org/apache/cassandra/service/GCInspector.java
@@ -99,8 +99,7 @@ public class GCInspector
             if (previousTotal.equals(total))
                 continue;
             gctimes.put(gc.getName(), total);
-            Long duration = total - previousTotal;
-            assert duration > 0;
+            Long duration = total - previousTotal; // may be zero for a really fast collection
 
             Long previousCount = gccounts.get(gc.getName());
             Long count = gc.getCollectionCount();