diff --git a/cabal-install/src/Distribution/Client/ProjectBuilding/UnpackedPackage.hs b/cabal-install/src/Distribution/Client/ProjectBuilding/UnpackedPackage.hs
index 74269211561..b4712090371 100644
--- a/cabal-install/src/Distribution/Client/ProjectBuilding/UnpackedPackage.hs
+++ b/cabal-install/src/Distribution/Client/ProjectBuilding/UnpackedPackage.hs
@@ -681,7 +681,7 @@ buildAndInstallUnpackedPackage
           hooksDir <- (</> "cabalHooks") <$> getCurrentDirectory
           -- run preBuildHook. If it returns with 0, we assume the build was
           -- successful. If not, run the build.
-          code <-
+          void $
             rawSystemExitCode
               verbosity
               (Just srcdir)
@@ -691,9 +691,12 @@ buildAndInstallUnpackedPackage
               , (getSymbolicPath builddir)
               ]
               Nothing
-              `catchIO` (\_ -> return (ExitFailure 10))
-          when (code /= ExitSuccess) $ do
-            runBuild
+              `catchIO` (\_ -> pure (ExitFailure 10))
+          -- Regardless of whether the preBuildHook exists or not, or whether it returned an
+          -- error or not, we want to run the post build.
+          -- If the preBuildHook downloads a cached version of the build products, the following
+          -- should be a NOOP.
+          runBuild
           -- not sure, if we want to care about a failed postBuildHook?
           void $
             rawSystemExitCode
@@ -705,7 +708,7 @@ buildAndInstallUnpackedPackage
               , (getSymbolicPath builddir)
               ]
               Nothing
-              `catchIO` (\_ -> return (ExitFailure 10))
+              `catchIO` (\_ -> pure (ExitFailure 10))
         PBHaddockPhase{runHaddock} -> do
           noticeProgress ProgressHaddock
           runHaddock