diff --git a/vcf2maf.py b/vcf2maf.py
index abd57c2..a6df7de 100644
--- a/vcf2maf.py
+++ b/vcf2maf.py
@@ -27,6 +27,7 @@
 import re
 import json
 from chardet import detect
+import warnings
 
 # ---------------------------- GLOBALS ----------------------------
 
@@ -863,6 +864,9 @@ def create_maf_record_from_vcf(sample_id, center_name, sequence_source, vcf_data
 def is_missing_data_value(value):
 	return (value in NULL_OR_MISSING_VALUES)
 
+def print_warning(message):
+    print(message)
+
 def process_datum(value):
 	"""
 		Returns a cleaned up data value.