diff --git a/.github/cosmo/build b/.github/cosmo/build
index 22c51c46..6c1f4087 100644
--- a/.github/cosmo/build
+++ b/.github/cosmo/build
@@ -3,7 +3,7 @@
 # copy janet recipe
 mkdir -p /sc/sueprconfigure/janet
 cp ./.github/cosmo/recipe.mk /sc/superconfigure/BUILD.mk
-cat 'include janet/BUILD.mk' >> /sc/superconfigure/custom.mk
+echo 'include janet/BUILD.mk' >> /sc/superconfigure/custom.mk
 
 export SOURCE_DIR=$(realpath .)