diff --git a/cabal-install/src/Distribution/Client/ProjectPlanning.hs b/cabal-install/src/Distribution/Client/ProjectPlanning.hs
index 3cb0d8033e8..5cb04eaf56b 100644
--- a/cabal-install/src/Distribution/Client/ProjectPlanning.hs
+++ b/cabal-install/src/Distribution/Client/ProjectPlanning.hs
@@ -258,7 +258,7 @@ sanityCheckElaboratedConfiguredPackage
   -> a
   -> a
 sanityCheckElaboratedConfiguredPackage
-  _sharedConfig
+  sharedConfig
   elab@ElaboratedConfiguredPackage{..} =
     ( case elabPkgOrComp of
         ElabPackage pkg -> sanityCheckElaboratedPackage elab pkg
@@ -273,10 +273,12 @@ sanityCheckElaboratedConfiguredPackage
       -- 'installedPackageId' we assigned is consistent with
       -- the 'hashedInstalledPackageId' we would compute from
       -- the elaborated configured package
-      -- . assert (isInplaceBuildStyle elabBuildStyle ||
-      --    elabComponentId == hashedInstalledPackageId
-      --                           (packageHashInputs sharedConfig elab))
-
+      . assert
+        ( isInplaceBuildStyle elabBuildStyle
+            || elabComponentId
+              == hashedInstalledPackageId
+                (packageHashInputs sharedConfig elab)
+        )
       -- the stanzas explicitly disabled should not be available
       . assert
         ( optStanzaSetNull $
@@ -3293,9 +3295,7 @@ pruneInstallPlanPass1 pkgs
     prune :: ElaboratedConfiguredPackage -> PrunedPackage
     prune elab = PrunedPackage elab' (pruneOptionalDependencies elab')
       where
-        elab' =
-          setDocumentation $
-            addOptionalStanzas elab
+        elab' = addOptionalStanzas elab
 
     graph = Graph.fromDistinctList pkgs'
 
@@ -3444,24 +3444,6 @@ pruneInstallPlanPass1 pkgs
             <> optionalStanzasWithDepsAvailable availablePkgs elab pkg
     addOptionalStanzas elab = elab
 
-    setDocumentation :: ElaboratedConfiguredPackage -> ElaboratedConfiguredPackage
-    setDocumentation elab@ElaboratedConfiguredPackage{elabPkgOrComp = ElabComponent comp} =
-      elab
-        { elabBuildHaddocks =
-            elabBuildHaddocks elab && documentationEnabled (compSolverName comp) elab
-        }
-      where
-        documentationEnabled c =
-          case c of
-            CD.ComponentLib -> const True
-            CD.ComponentSubLib _ -> elabHaddockInternal
-            CD.ComponentFLib _ -> elabHaddockForeignLibs
-            CD.ComponentExe _ -> elabHaddockExecutables
-            CD.ComponentTest _ -> elabHaddockTestSuites
-            CD.ComponentBench _ -> elabHaddockBenchmarks
-            CD.ComponentSetup -> const False
-    setDocumentation elab = elab
-
     -- Calculate package dependencies but cut out those needed only by
     -- optional stanzas that we've determined we will not enable.
     -- These pruned deps are not persisted in this pass since they're based on
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/a.cabal b/cabal-testsuite/PackageTests/HaddockBuildDepends/a.cabal
new file mode 100644
index 00000000000..552ef337ea6
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/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, lib
+    hs-source-dirs:   src
+    default-language: Haskell2010
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/cabal.project b/cabal-testsuite/PackageTests/HaddockBuildDepends/cabal.project
new file mode 100644
index 00000000000..e6fdbadb439
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/cabal.project
@@ -0,0 +1 @@
+packages: .
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/cabal.test.hs b/cabal-testsuite/PackageTests/HaddockBuildDepends/cabal.test.hs
new file mode 100644
index 00000000000..28821c5e858
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/cabal.test.hs
@@ -0,0 +1,22 @@
+import Test.Cabal.Prelude
+
+
+main = cabalTest . withRepo "repo" $ do
+    cabal "build" ["--enable-documentation"]
+
+    env <- getTestEnv
+    let storeDir = testCabalDir env </> "store"
+
+    -- Check properties of executable component
+    libDir <- liftIO $ findDependencyInStore storeDir "exe"
+    -- Documentation is enabled..
+    assertFileDoesContain (libDir </> "cabal-hash.txt") "documentation: True"
+    -- But not built
+    shouldDirectoryNotExist (  libDir </> "share" </> "doc" )
+
+    -- Check properties of library
+    libDir <- liftIO $ findDependencyInStore storeDir "lib"
+    -- Documentation is enabled..
+    assertFileDoesContain (libDir </> "cabal-hash.txt") "documentation: True"
+    -- and has been built
+    shouldDirectoryExist (  libDir </> "share" </> "doc" )
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/exe-1/Main.hs b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/exe-1/Main.hs
new file mode 100644
index 00000000000..de106fe48f9
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/exe-1/Main.hs
@@ -0,0 +1,3 @@
+module Main where
+
+main = return ()
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/exe-1/exe.cabal b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/exe-1/exe.cabal
new file mode 100644
index 00000000000..a5c1b537d7b
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/exe-1/exe.cabal
@@ -0,0 +1,12 @@
+name:                exe
+version:             1
+license:             BSD3
+author:              Edward Z. Yang
+maintainer:          ezyang@cs.stanford.edu
+build-type:          Simple
+cabal-version:       2.0
+
+executable exe
+  build-depends:       base
+  main-is:             Main.hs
+  default-language:    Haskell2010
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/lib-1/Lib.hs b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/lib-1/Lib.hs
new file mode 100644
index 00000000000..6d85a26fe10
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/lib-1/Lib.hs
@@ -0,0 +1 @@
+module Lib where
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/lib-1/lib.cabal b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/lib-1/lib.cabal
new file mode 100644
index 00000000000..526338f344f
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/repo/lib-1/lib.cabal
@@ -0,0 +1,13 @@
+name:                lib
+version:             1
+license:             BSD3
+author:              Edward Z. Yang
+maintainer:          ezyang@cs.stanford.edu
+build-type:          Simple
+cabal-version:       2.0
+
+library
+  build-depends:       base
+  build-tool-depends:  exe:exe
+  exposed-modules:     Lib
+  default-language:    Haskell2010
diff --git a/cabal-testsuite/PackageTests/HaddockBuildDepends/src/MyLib.hs b/cabal-testsuite/PackageTests/HaddockBuildDepends/src/MyLib.hs
new file mode 100644
index 00000000000..bbaef0a6d64
--- /dev/null
+++ b/cabal-testsuite/PackageTests/HaddockBuildDepends/src/MyLib.hs
@@ -0,0 +1,4 @@
+module MyLib (someFunc) where
+
+someFunc :: IO ()
+someFunc = return ()