diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index be2c937fb..9c0d4fb78 100644
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -409,6 +409,5 @@ mv --no-target-directory "$OUTDIR" "$ACTUAL_OUTDIR" \
         find "$ACTUAL_OUTDIR" -type f
     } | xargs realpath --relative-base="$PWD" \
       | xargs sha256sum \
-      | sort -k2 \
-      | sponge "$LOGDIR"/SHA256SUMS.part
+      | sort -k2 -o "$LOGDIR"/SHA256SUMS.part
 )
diff --git a/contrib/guix/manifest.scm b/contrib/guix/manifest.scm
index 23f917171..f44078339 100644
--- a/contrib/guix/manifest.scm
+++ b/contrib/guix/manifest.scm
@@ -257,7 +257,6 @@ chain for " target " development."))
         patch
         gawk
         sed
-        moreutils ; sponge is used to construct the SHA256SUMS.part file in libexec/build.sh
         patchelf  ; unused, occassionally useful for debugging
 
         ;; Compression and archiving