diff --git a/.appveyor.yml b/.appveyor.yml
index 047555d..53c72d9 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -15,6 +15,14 @@
 cache:
   - C:\Users\appveyor\.tools -> appveyor\do.py
 
+#---------------------------------#
+#       additional packages       #
+#---------------------------------#
+
+install:
+# for the sequencer
+  - cinst re2c
+
 #---------------------------------#
 #       repository cloning        #
 #---------------------------------#