diff --git a/dev/pkgbuild-macosx.sh b/dev/pkgbuild-macosx.sh
index 57f6c60..9c1c50a 100755
--- a/dev/pkgbuild-macosx.sh
+++ b/dev/pkgbuild-macosx.sh
@@ -338,6 +338,7 @@ productbuild --distribution $DISTFILE \
              --version $VERSION \
              --resources $SRCDIR/$CTOOLS \
              --package-path $PKGDIR \
+             --sign 'ctools' \
              $PRODDIR/$CTOOLS.pkg
 
 # Add additional files to production folder