diff --git a/RecoTracker/TkSeedGenerator/python/trackerClusterCheck_cfi.py b/RecoTracker/TkSeedGenerator/python/trackerClusterCheck_cfi.py
index 8fcdb37f5e34a..4d0c9646c8bf1 100644
--- a/RecoTracker/TkSeedGenerator/python/trackerClusterCheck_cfi.py
+++ b/RecoTracker/TkSeedGenerator/python/trackerClusterCheck_cfi.py
@@ -23,5 +23,6 @@
 pp_on_AA_2018.toModify(trackerClusterCheck,
                doClusterCheck=True, 
                cut = "strip < 1000000 && pixel < 150000 && (strip < 50000 + 10*pixel) && (pixel < 5000 + strip/2.)",
-               MaxNumberOfPixelClusters = 150000
+               MaxNumberOfPixelClusters = 150000,
+               MaxNumberOfCosmicClusters = 500000
                )