diff --git a/nix/ci.sh b/nix/ci.sh
index 5ae455a..b0785ff 100755
--- a/nix/ci.sh
+++ b/nix/ci.sh
@@ -17,10 +17,10 @@ function build-one {
   # nix-build --no-out-link nix/all.nix -A "\"$ATTRPATH\".butcher.components.tests"\
   #   2> >(tee "$OUTDIR/$ATTRPATH-2-build-test.txt" >&2)
   # (($? == 0)) || { echo "$ATTRPATH: build test failed" >> "$SUMMARY"; return 1; }
-  nix-build -o "$OUTDIR/$ATTRPATH-build" nix/all.nix -A "\"$ATTRPATH\".allComponents"\
+  nix-build -o "$OUTDIR/$ATTRPATH-build" nix/all.nix -Q -A "\"$ATTRPATH\".allComponents"\
     2> >(tee "$OUTDIR/$ATTRPATH-build.txt" >&2)
   (($? == 0)) || { echo "$ATTRPATH: all-component build failed" >> "$SUMMARY"; return 1; }
-  nix-build -o "$OUTDIR/$ATTRPATH-test-result.txt" nix/all.nix -A "\"$ATTRPATH\".butcher.checks.tests"
+  nix-build -o "$OUTDIR/$ATTRPATH-test-result.txt" -Q nix/all.nix -A "\"$ATTRPATH\".butcher.checks.tests"
   (($? == 0)) || { echo "$ATTRPATH: run test failed" >> "$SUMMARY"; return 1; }
   echo "$ATTRPATH: $(grep examples "$OUTDIR/$ATTRPATH-test-result.txt")" >> "$SUMMARY"
 }
diff --git a/nix/create-roots.sh b/nix/create-roots.sh
index 82e56d5..68e7e85 100755
--- a/nix/create-roots.sh
+++ b/nix/create-roots.sh
@@ -5,15 +5,15 @@ ROOTSDIR="nix/gcroots"
 
 function create-root {
   local ATTRPATH=$1
-  nix-build -o "${ROOTSDIR}/${ATTRPATH}-shell" nix/all.nix -A "\"$ATTRPATH\".shell"
-  nix-build -o "${ROOTSDIR}/${ATTRPATH}-test" nix/all.nix -A "\"$ATTRPATH\".butcher.components.tests.tests"
-  nix-build -o "${ROOTSDIR}/${ATTRPATH}-plan" nix/all.nix -A "\"$ATTRPATH\".butcher-plan"
-  nix-build -o "${ROOTSDIR}/${ATTRPATH}-nix" nix/all.nix -A "\"$ATTRPATH\".butcher-nix" || true
+  nix-build -Q -o "${ROOTSDIR}/${ATTRPATH}-shell" nix/all.nix -A "\"$ATTRPATH\".shell"
+  nix-build -Q -o "${ROOTSDIR}/${ATTRPATH}-test" nix/all.nix -A "\"$ATTRPATH\".butcher.components.tests.tests"
+  nix-build -Q -o "${ROOTSDIR}/${ATTRPATH}-plan" nix/all.nix -A "\"$ATTRPATH\".butcher-plan"
+  nix-build -Q -o "${ROOTSDIR}/${ATTRPATH}-nix" nix/all.nix -A "\"$ATTRPATH\".butcher-nix" || true
 }
 
 mkdir -p "$ROOTSDIR"
 
-nix-build -o "${ROOTSDIR}/haskell-nix-roots" nix/all.nix -A "roots"
+nix-build -Q -o "${ROOTSDIR}/haskell-nix-roots" nix/all.nix -A "roots"
 
 create-root "stackage-8.4"
 create-root "stackage-8.6"