diff --git a/src/test_read+write.py b/src/test_read+write.py
index a56e8d9..505443f 100755
--- a/src/test_read+write.py
+++ b/src/test_read+write.py
@@ -4,7 +4,7 @@
 from bioc import BioCWriter
 
 test_file = '../test_input/PMID-8557975-simplified-sentences.xml'
-dtd_file = '../test_input/BioC.dtd'
+dtd_file = '../BioC.dtd'
 
 def main():
     bioc_reader = BioCReader(test_file, dtd_valid_file=dtd_file)