diff --git a/.travis.yml b/.travis.yml
index a67ec03..d148072 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -277,7 +277,7 @@ script:
       if [ -f configure.ac ]; then autoreconf -i; fi
       cabal configure --enable-tests --enable-benchmarks -v  # -v2 provides useful information for debugging
       better_wait cabal build -j$JOBS --ghc-options="-j1 +RTS -M500M -RTS -Werror" # this builds all libraries and executables (including tests/benchmarks)
-      cabal test
+      time cabal test --ghc-options="-with-rtsopts -N1"
       ;;
     cabaldist)
       # cabal check
@@ -292,7 +292,7 @@ script:
     canew)
       better_wait cabal new-build -j$JOBS --ghc-options="-j1 +RTS -M500M -RTS" --disable-tests --disable-benchmarks
       better_wait cabal new-build -j$JOBS --ghc-options="-j1 +RTS -M500M -RTS" --enable-tests --enable-benchmarks
-      cabal new-test -j1 --ghc-options="-j1 +RTS -M500M -RTS"
+      time cabal new-test -j1 --ghc-options="-j1 +RTS -M500M -RTS"
       ;;
   esac
   set +ex
diff --git a/brittany.cabal b/brittany.cabal
index 4d43fcc..da69f91 100644
--- a/brittany.cabal
+++ b/brittany.cabal
@@ -269,6 +269,10 @@ test-suite unittests
     -fno-warn-unused-imports
     -rtsopts
     -with-rtsopts "-M2G"
+    -threaded
+    -- ^ threaded is not necessary at all, but our CI trusts on being able
+    --   to pass -N1, which is not possible without threaded :-/
+    --   (plus -no-threaded is not a thing, afaict)
   }
 
 test-suite littests
@@ -372,4 +376,8 @@ test-suite libinterfacetests
     -fno-warn-unused-imports
     -rtsopts
     -with-rtsopts "-M2G"
+    -threaded
+    -- ^ threaded is not necessary at all, but our CI trusts on being able
+    --   to pass -N1, which is not possible without threaded :-/
+    --   (plus -no-threaded is not a thing, afaict)
   }
diff --git a/src-literatetests/Main.hs b/src-literatetests/Main.hs
index 1196a56..284c696 100644
--- a/src-literatetests/Main.hs
+++ b/src-literatetests/Main.hs
@@ -23,7 +23,6 @@ import Language.Haskell.Brittany.Internal.Config.Types
 import Language.Haskell.Brittany.Internal.Config
 
 import Data.Coerce ( coerce )
-import GHC.Conc    ( getNumCapabilities )
 
 import qualified Data.Text.IO as Text.IO
 import           System.FilePath ( (</>) )
@@ -50,8 +49,7 @@ main = do
   let groups = createChunks =<< inputs
   inputCtxFree <- Text.IO.readFile "src-literatetests/30-tests-context-free.blt"
   let groupsCtxFree = createChunks inputCtxFree
-  jobs <- getNumCapabilities
-  hspecWith (defaultConfig { configConcurrentJobs = Just jobs }) $ do
+  hspec $ do
     groups `forM_` \(groupname, tests) -> do
       describe (Text.unpack groupname) $ tests `forM_` \(name, pend, inp) -> do
         (if pend then before_ pending else id)