diff --git a/.github/workflows/linux-nightly.yml b/.github/workflows/linux-nightly.yml
index 1610697d8..4ff6caabb 100644
--- a/.github/workflows/linux-nightly.yml
+++ b/.github/workflows/linux-nightly.yml
@@ -172,8 +172,8 @@ jobs:
 
     - name: Build hledger and test unit tests, doc tests
       run: |
-        stack $ARGS build --ghc-options=-Werror --test --bench
-        #  --no-terminal  #  --no-run-benchmarks
+        stack $ARGS build --pedantic --test --bench
+        #  --ghc-options=-Werror --no-terminal  #  --no-run-benchmarks
       env:
         ARGS: ${{ matrix.plan.resolver }}
 
diff --git a/.github/workflows/mac-nightly.yml b/.github/workflows/mac-nightly.yml
index 4e930175d..435dafaf9 100644
--- a/.github/workflows/mac-nightly.yml
+++ b/.github/workflows/mac-nightly.yml
@@ -118,6 +118,7 @@ jobs:
     - name: Build hledger and test unit tests, doc tests
       run: |
         stack build --pedantic --test
+      #  --ghc-options=-Werror
 
     - name: Install shelltestrunner
       run: |
diff --git a/hledger-lib/test/unittest.hs b/hledger-lib/test/unittest.hs
index dca9dbbbb..c47857d85 100644
--- a/hledger-lib/test/unittest.hs
+++ b/hledger-lib/test/unittest.hs
@@ -8,6 +8,7 @@ import "hledger-lib" Hledger (tests_Hledger)
 import System.Environment (setEnv)
 import Test.Tasty (defaultMain)
 
+main :: IO ()
 main = do
   setEnv "TASTY_HIDE_SUCCESSES" "true"
   setEnv "TASTY_ANSI_TRICKS" "false"  -- helps the above
diff --git a/hledger/test/unittest.hs b/hledger/test/unittest.hs
index ac122f1bc..af9a77c6a 100644
--- a/hledger/test/unittest.hs
+++ b/hledger/test/unittest.hs
@@ -10,6 +10,7 @@ import Hledger.Cli (tests_Hledger_Cli)
 import System.Environment (setEnv)
 import Test.Tasty (defaultMain)
 
+main :: IO ()
 main = do
   setEnv "TASTY_HIDE_SUCCESSES" "true"
   setEnv "TASTY_ANSI_TRICKS" "false"  -- helps the above