diff --git a/tools/filters/gff/gtf_filter_by_attribute_values_list.py b/tools/filters/gff/gtf_filter_by_attribute_values_list.py
index cb641f40e05..8be10348557 100644
--- a/tools/filters/gff/gtf_filter_by_attribute_values_list.py
+++ b/tools/filters/gff/gtf_filter_by_attribute_values_list.py
@@ -60,9 +60,8 @@ def gff_filter(gff_file, attribute_name, ids_file, output_file):
                 continue
             fields = line.split('\t')
             attributes = parse_gff_attributes(fields[8])
-            if (attribute_name in attributes) and (attributes[attribute_name] in ids_dict):
+            if attribute_name in attributes and attributes[attribute_name] in ids_dict:
                 output.write(line)
-        output.close()
 
 
 if __name__ == "__main__":
diff --git a/tools/filters/gff/gtf_filter_by_attribute_values_list.xml b/tools/filters/gff/gtf_filter_by_attribute_values_list.xml
index ef7461f3d4f..bf014ae8b7c 100644
--- a/tools/filters/gff/gtf_filter_by_attribute_values_list.xml
+++ b/tools/filters/gff/gtf_filter_by_attribute_values_list.xml
@@ -1,8 +1,8 @@
 <tool id="gtf_filter_by_attribute_values_list" name="Filter GTF data by attribute values_list" version="0.2">
     <description></description>
-    <command>
-        python '$__tool_directory__/gtf_filter_by_attribute_values_list.py' '$input' '$attribute_name' '$ids' '$output'
-    </command>
+    <command><![CDATA[
+python '$__tool_directory__/gtf_filter_by_attribute_values_list.py' '$input' $attribute_name '$ids' '$output'
+    ]]></command>
     <inputs>
         <param format="gtf" name="input" type="data" label="Filter"/>
         <param name="attribute_name" type="select" label="Using attribute name">