diff --git a/pyembroidery/DatReader.py b/pyembroidery/DatReader.py
index 1359c41..f02cf35 100644
--- a/pyembroidery/DatReader.py
+++ b/pyembroidery/DatReader.py
@@ -1,4 +1,4 @@
-from EmbConstant import FAST, SLOW
+from .EmbConstant import FAST, SLOW
 
 
 def read_barudan_dat(f, out):