diff --git a/madoop/mapreduce.py b/madoop/mapreduce.py
index 138617c..289f771 100644
--- a/madoop/mapreduce.py
+++ b/madoop/mapreduce.py
@@ -16,7 +16,7 @@
 
 
 # Large input files are automatically split
-MAX_INPUT_SPLIT_SIZE = 2**20  # 1 MB
+MAX_INPUT_SPLIT_SIZE = 2**21  # 2 MB
 
 # The number of reducers is dynamically determined by the number of unique keys
 # but will not be more than num_reducers