diff --git a/src/java/org/apache/cassandra/utils/FBUtilities.java b/src/java/org/apache/cassandra/utils/FBUtilities.java
index 732d143cb1..87bed53178 100644
--- a/src/java/org/apache/cassandra/utils/FBUtilities.java
+++ b/src/java/org/apache/cassandra/utils/FBUtilities.java
@@ -575,7 +575,7 @@ public class FBUtilities
 
     public static String toString(Map<?,?> map)
     {
-        Joiner.MapJoiner joiner = Joiner.on(",").withKeyValueSeparator(":");
+        Joiner.MapJoiner joiner = Joiner.on(", ").withKeyValueSeparator(":");
         return joiner.join(map);
     }