diff --git a/pkgs/development/tools/build-managers/cmake/setup-hook.sh b/pkgs/development/tools/build-managers/cmake/setup-hook.sh
index c4684e0376ce..b14e9984bc3c 100755
--- a/pkgs/development/tools/build-managers/cmake/setup-hook.sh
+++ b/pkgs/development/tools/build-managers/cmake/setup-hook.sh
@@ -57,6 +57,7 @@ cmakeConfigurePhase() {
 }
 
 if [ -z "$dontUseCmakeConfigure" -a -z "$configurePhase" ]; then
+    setOutputFlags=
     configurePhase=cmakeConfigurePhase
 fi