diff --git a/tools/stress/src/org/apache/cassandra/stress/settings/SettingsPopulation.java b/tools/stress/src/org/apache/cassandra/stress/settings/SettingsPopulation.java
index 9425776b33..53c45ab512 100644
--- a/tools/stress/src/org/apache/cassandra/stress/settings/SettingsPopulation.java
+++ b/tools/stress/src/org/apache/cassandra/stress/settings/SettingsPopulation.java
@@ -112,7 +112,7 @@ public class SettingsPopulation implements Serializable
 
         public SequentialOptions(String defaultLimit)
         {
-            populate = new OptionSimple("seq=", "[0-9]+\\.\\.+[0-9]+[MBK]?",
+            populate = new OptionSimple("seq=", "[0-9]+[MBK]?\\.\\.+[0-9]+[MBK]?",
                     "1.." + defaultLimit,
                     "Generate all seeds in sequence", true);
         }