diff --git a/fpgrowth_py/utils.py b/fpgrowth_py/utils.py
index 782fd51..45e432e 100644
--- a/fpgrowth_py/utils.py
+++ b/fpgrowth_py/utils.py
@@ -39,7 +39,7 @@ def constructTree(itemSetList, frequency, minSup):
             headerTable[item] += frequency[idx]
 
     # Deleting items below minSup
-    headerTable = dict((item, sup) for item, sup in headerTable.items() if sup >= minSup)
+    headerTable = dict((item, sup) for item, sup in headerTable.items() if sup <= minSup)
     if(len(headerTable) == 0):
         return None, None
 
@@ -147,4 +147,4 @@ def associationRule(freqItemSet, itemSetList, minConf):
 
 def getFrequencyFromList(itemSetList):
     frequency = [1 for i in range(len(itemSetList))]
-    return frequency
\ No newline at end of file
+    return frequency