diff --git a/cabal-install/src/Distribution/Client/ProjectBuilding.hs b/cabal-install/src/Distribution/Client/ProjectBuilding.hs
index 19a6661b6f6..0381af55004 100644
--- a/cabal-install/src/Distribution/Client/ProjectBuilding.hs
+++ b/cabal-install/src/Distribution/Client/ProjectBuilding.hs
@@ -81,7 +81,7 @@ import           Distribution.Types.BuildType
 import           Distribution.Types.PackageDescription.Lens (componentModules)
 import           Distribution.Simple.Program
 import qualified Distribution.Simple.Setup as Cabal
-import           Distribution.Simple.Command (CommandUI)
+import           Distribution.Simple.Command (CommandUI, commandName)
 import qualified Distribution.Simple.Register as Cabal
 import           Distribution.Simple.LocalBuildInfo
                    ( ComponentName(..), LibraryName(..) )
diff --git a/cabal-install/src/Distribution/Client/SetupWrapper.hs b/cabal-install/src/Distribution/Client/SetupWrapper.hs
index e4885ed07c6..9453897e88e 100644
--- a/cabal-install/src/Distribution/Client/SetupWrapper.hs
+++ b/cabal-install/src/Distribution/Client/SetupWrapper.hs
@@ -145,6 +145,7 @@ data SetupMethod = InternalMethod
                    -- child process
                  | ExternalMethod FilePath
                    -- ^ run Cabal commands through a custom \"Setup\" executable
+  deriving Show
 
 -- TODO: The 'setupWrapper' and 'SetupScriptOptions' should be split into two
 -- parts: one that has no policy and just does as it's told with all the
diff --git a/cabal-install/tests/IntegrationTests2.hs b/cabal-install/tests/IntegrationTests2.hs
index 65278bc12d1..c1527e0bda2 100644
--- a/cabal-install/tests/IntegrationTests2.hs
+++ b/cabal-install/tests/IntegrationTests2.hs
@@ -37,22 +37,26 @@ import Distribution.Solver.Types.ConstraintSource
 import Distribution.Solver.Types.PackageConstraint
          ( PackageProperty(PackagePropertySource) )
 
-import qualified Distribution.Client.CmdBuild   as CmdBuild
-import qualified Distribution.Client.CmdRepl    as CmdRepl
-import qualified Distribution.Client.CmdRun     as CmdRun
-import qualified Distribution.Client.CmdTest    as CmdTest
-import qualified Distribution.Client.CmdBench   as CmdBench
-import qualified Distribution.Client.CmdHaddock as CmdHaddock
-import qualified Distribution.Client.CmdListBin as CmdListBin
+import qualified Distribution.Client.CmdBuild          as CmdBuild
+import qualified Distribution.Client.CmdRepl           as CmdRepl
+import qualified Distribution.Client.CmdRun            as CmdRun
+import qualified Distribution.Client.CmdTest           as CmdTest
+import qualified Distribution.Client.CmdBench          as CmdBench
+import qualified Distribution.Client.CmdHaddock        as CmdHaddock
+import qualified Distribution.Client.CmdHaddockProject as CmdHaddockProject
+import qualified Distribution.Client.CmdListBin        as CmdListBin
 
 import Distribution.Package
 import Distribution.PackageDescription
 import Distribution.InstalledPackageInfo (InstalledPackageInfo)
-import Distribution.Simple.Setup (toFlag, HaddockFlags(..), defaultHaddockFlags)
-import Distribution.Client.Setup (globalCommand)
+import Distribution.Simple.Setup
+         ( toFlag, HaddockFlags(..), HaddockProjectFlags (..)
+         , defaultHaddockFlags, defaultHaddockProjectFlags )
+import Distribution.Client.Setup (globalCommand, globalStoreDir)
 import Distribution.Client.Config (loadConfig, SavedConfig(savedGlobalFlags))
 import Distribution.Simple.Compiler
 import Distribution.Simple.Command
+import Distribution.Client.GlobalFlags (defaultGlobalFlags)
 import qualified Distribution.Simple.Flag as Flag
 import Distribution.System
 import Distribution.Version
@@ -149,6 +153,13 @@ tests config =
       testCase "Test Nix Flag" testNixFlags,
       testCase "Test Ignore Project Flag" testIgnoreProjectFlag
     ]
+-- `haddock-project` is only supported by `haddock-2.26.1` and above which is
+-- shipped with `ghc-9.4`
+#if __GLASGOW_HASKELL__ >= 904
+  , testGroup "haddock-project"
+    [ testCase "dependencies" testHaddockProjectDependencies
+    ]
+#endif
   ]
 
 testTargetSelectors :: (String -> IO ()) -> Assertion
@@ -1968,3 +1979,34 @@ testIgnoreProjectFlag = do
     emptyConfig = mempty
     ignoreSetConfig :: ProjectConfig
     ignoreSetConfig = mempty { projectConfigShared = mempty { projectConfigIgnoreProject = Flag True } }
+
+
+cleanHaddockProject :: FilePath -> IO ()
+cleanHaddockProject testdir = do
+    cleanProject testdir
+    let haddocksdir = basedir </> testdir </> "haddocks"
+    alreadyExists <- doesDirectoryExist haddocksdir
+    when alreadyExists $ removePathForcibly haddocksdir
+    let storedir = basedir </> testdir </> "store"
+    alreadyExists' <- doesDirectoryExist storedir
+    when alreadyExists' $ removePathForcibly storedir
+
+
+#if __GLASGOW_HASKELL__ >= 904
+testHaddockProjectDependencies :: Assertion
+testHaddockProjectDependencies = do
+    let dir = basedir </> testdir
+    cleanHaddockProject testdir
+    withCurrentDirectory dir $ do
+      CmdHaddockProject.haddockProjectAction
+        defaultHaddockProjectFlags { haddockProjectVerbosity = Flag verbosity }
+        ["all"]
+        defaultGlobalFlags { globalStoreDir = Flag "store" }
+
+      let haddock = "haddocks" </> "async" </> "async.haddock"
+      hasHaddock <- doesFileExist haddock
+      unless hasHaddock $ assertFailure ("File `" ++ haddock ++ "` does not exist.")
+    cleanHaddockProject testdir
+  where
+    testdir = "haddock-project/dependencies"
+#endif
diff --git a/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/a.cabal b/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/a.cabal
new file mode 100644
index 00000000000..831be636bec
--- /dev/null
+++ b/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/a.cabal
@@ -0,0 +1,10 @@
+name: a
+version: 0.1.0.0
+build-type: Simple
+cabal-version: >= 1.10
+
+library
+    exposed-modules:  MyLib
+    build-depends:    base, async
+    hs-source-dirs:   src
+    default-language: Haskell2010
diff --git a/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/cabal.project b/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/cabal.project
new file mode 100644
index 00000000000..052c3c8685d
--- /dev/null
+++ b/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/cabal.project
@@ -0,0 +1,8 @@
+packages: .
+-- `jobs` is necessary to use `InternalMethod :: SetupMethod`.
+jobs: 1
+
+documentation: True
+
+package async
+  documentation: True
diff --git a/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/src/MyLib.hs b/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/src/MyLib.hs
new file mode 100644
index 00000000000..b0b955743ad
--- /dev/null
+++ b/cabal-install/tests/IntegrationTests2/haddock-project/dependencies/src/MyLib.hs
@@ -0,0 +1,6 @@
+module MyLib (someFunc) where
+
+import Control.Concurrent.Async
+
+someFunc :: IO (Async ())
+someFunc = async (return ())