diff --git a/schema/error_processor.py b/schema/error_processor.py
index 4bf4ddf..4b75207 100755
--- a/schema/error_processor.py
+++ b/schema/error_processor.py
@@ -302,12 +302,20 @@ def isTypeMatch(self, iiifPath, iiif_asset, schemaType, IIIFJsonPath):
                 if isinstance(item, int):
                     indexes.append(item)
             count = 0        
+            #print (iiifPath)
+            indexDelta = 0
             for index in find(iiifPath, '_'):
+                index += indexDelta
                 #print ('Replacing {} with {}'.format(iiifPath[index], indexes[count]))
                 iiifPath = iiifPath[:index] + str(indexes[count]) + iiifPath[index + 1:]
+                # if you replace [_] with a number greater than 9 you are taking up two spaces in the
+                # string so the index in the for loop starts to be off by one. Calculating the delta
+                # sorts this out
+                if len(str(indexes[count])) > 1:
+                    indexDelta += len(str(indexes[count])) -1
                 count += 1
 
-        #print ('JsonPath: {}'.format(iiifPath))
+        #print ('JsonPath: {} IIIF Path {} '.format(iiifPath, IIIFJsonPath))
         path = parse(iiifPath)
         results = path.find(iiif_asset)
         if not results:
diff --git a/setup.py b/setup.py
index 46a8e49..e13733e 100644
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,8 @@ def run(self):
         'requests'
     ],
     extras_require={
-        ':python_version>="3.0"': ["Pillow>=3.2.0"],
+        ':python_version>="3.6"': ["Pillow>=3.2.0"],
+        ':python_version=="3.5"': ["Pillow==7.2.0"],
         ':python_version<"3.0"': [
             "Pillow==6.2.2",
             "zipp==1.2.0",