diff --git a/tests/io/file_long_read3.py b/tests/io/file_long_read3.py
index f25f04438..d8b0cce55 100644
--- a/tests/io/file_long_read3.py
+++ b/tests/io/file_long_read3.py
@@ -1,4 +1,4 @@
-f = open("io/data/bigfile2", "rb")
+f = open("io/data/bigfile1", "rb")
 b = f.read(512)
 print(len(b))
 print(b)