diff --git a/office/gnucash/gnucash.SlackBuild b/office/gnucash/gnucash.SlackBuild
index f89beedc9d..7f1f28e243 100644
--- a/office/gnucash/gnucash.SlackBuild
+++ b/office/gnucash/gnucash.SlackBuild
@@ -126,7 +126,7 @@ cd build
     -DGNUCASH_BUILD_ID="$VERSION-`date -I` by $PACKAGER" \
     -DCMAKE_BUILD_TYPE=release ..
 
-DESTDIR="$PKG" ninja install
+DESTDIR="$PKG" $NINJA install
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true