diff --git a/dap/algos/aggregation.py b/dap/algos/aggregation.py
index 87987fd..f7d3e71 100644
--- a/dap/algos/aggregation.py
+++ b/dap/algos/aggregation.py
@@ -51,8 +51,9 @@ def calc_aggregate(results, data, aggregator):
 
 
 def calc_aggregation_ready(results, aggregator):
-    aggregation_max = results.get("aggregation_max")
-    if not aggregator.is_ready(aggregation_max):
+    aggregator.nmax = results.get("aggregation_max")
+
+    if not aggregator.is_ready():
         return False
 
     aggregator.reset()
diff --git a/dap/utils/aggregator.py b/dap/utils/aggregator.py
index d1f18f7..03f7ba8 100644
--- a/dap/utils/aggregator.py
+++ b/dap/utils/aggregator.py
@@ -7,6 +7,7 @@ class Aggregator:
     def reset(self):
         self.data = None
         self.counter = 0
+        self.nmax = None
 
     def add(self, item):
         if self.data is None:
@@ -19,13 +20,13 @@ class Aggregator:
 
     __iadd__ = add
 
-    def is_ready(self, nmax):
-        if nmax is None:
+    def is_ready(self):
+        if self.nmax is None:
             return False
-        return (self.counter >= nmax)
+        return (self.counter >= self.nmax)
 
     def __repr__(self):
-        return f"{self.data!r} / {self.counter}"
+        return f"{self.data!r} # ({self.counter} / {self.nmax})"