diff --git a/hledger-lib/test/unittest.hs b/hledger-lib/test/unittest.hs
index f64365ff9..dca9dbbbb 100644
--- a/hledger-lib/test/unittest.hs
+++ b/hledger-lib/test/unittest.hs
@@ -9,5 +9,6 @@ import System.Environment (setEnv)
 import Test.Tasty (defaultMain)
 
 main = do
-  setEnv "TASTY_HIDE_SUCCESSES" "1"
+  setEnv "TASTY_HIDE_SUCCESSES" "true"
+  setEnv "TASTY_ANSI_TRICKS" "false"  -- helps the above
   defaultMain tests_Hledger
diff --git a/hledger/test/unittest.hs b/hledger/test/unittest.hs
index 21b338f93..ac122f1bc 100644
--- a/hledger/test/unittest.hs
+++ b/hledger/test/unittest.hs
@@ -11,5 +11,6 @@ import System.Environment (setEnv)
 import Test.Tasty (defaultMain)
 
 main = do
-  setEnv "TASTY_HIDE_SUCCESSES" "1"
+  setEnv "TASTY_HIDE_SUCCESSES" "true"
+  setEnv "TASTY_ANSI_TRICKS" "false"  -- helps the above
   defaultMain tests_Hledger_Cli