diff --git a/stack.yaml b/stack.yaml
index 1b790660d..352d55d81 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -10,6 +10,9 @@ packages:
 - hledger-api
 
 extra-deps:
+# try workaround for appveyor, https://github.com/yav/pretty-show/issues/27
+- git: git@github.com:simonmichael/pretty-show.git
+  commit: 225bcff3302f72cf739172f4e42792a7448eaa6c
 # hledger-lib
 - easytest-0.1.1
 # hledger-ui