diff --git a/plio/io/io_moon_minerology_mapper.py b/plio/io/io_moon_minerology_mapper.py
index a479ca5e8f656f0495c907a92daf6597a924214c..cce772febecedefce31c1303af06e249e02ba22a 100644
--- a/plio/io/io_moon_minerology_mapper.py
+++ b/plio/io/io_moon_minerology_mapper.py
@@ -15,7 +15,7 @@ def openm3(input_data):
 
 def metadatatoband(metadata):
     wv2band = []
-    for k, v in metadata.iteritems():
+    for k, v in metadata.items():
         try:
             wv2band.append(float(value))
         except: