diff --git a/cabal-install/Distribution/Client/ProjectOrchestration.hs b/cabal-install/Distribution/Client/ProjectOrchestration.hs
index 25e4c813644..4daaa5a6dbc 100644
--- a/cabal-install/Distribution/Client/ProjectOrchestration.hs
+++ b/cabal-install/Distribution/Client/ProjectOrchestration.hs
@@ -349,11 +349,11 @@ runProjectPostBuildPhase verbosity
                          pkgsBuildStatus
                          buildOutcomes
 
-    _ <- writePlanGhcEnvironment (distProjectRootDirectory
-                                    distDirLayout)
-                                 elaboratedPlanOriginal
-                                 elaboratedShared
-                                 postBuildStatus
+    void $ writePlanGhcEnvironment (distProjectRootDirectory
+                                      distDirLayout)
+                                   elaboratedPlanOriginal
+                                   elaboratedShared
+                                   postBuildStatus
 
     -- Finally if there were any build failures then report them and throw
     -- an exception to terminate the program