diff --git a/Makefile b/Makefile
index 54b08b6..e31486e 100644
--- a/Makefile
+++ b/Makefile
@@ -29,10 +29,9 @@ webpack-dev-server: ## Servidor de prueba de Webpack
 
 # Tomar los códigos de los íconos de este archivo y copiarlos a fa.txt
 # node_modules/font-awesome/scss/_variables.scss
-whitelist = $(shell grep -v "^#" fa.txt | sed "s/^/U+/" | tr "\n" ",")
 assets/fonts/forkawesome-webfont.woff2: fa.txt
 	which glyphhanger || npm i -g glyphhanger
-	glyphhanger --subset=node_modules/fork-awesome/fonts/forkawesome-webfont.ttf --formats=woff2 --whitelist=$(whitelist)
+	grep -v "^#" fa.txt | sed "s/^/U+/" | tr "\n" "," | xargs -rI {} glyphhanger --subset=node_modules/fork-awesome/fonts/forkawesome-webfont.ttf --formats=woff2 --whitelist="{}"
 	mv node_modules/fork-awesome/fonts/forkawesome-webfont-subset.woff2 $@
 
 fa: assets/fonts/forkawesome-webfont.woff2 ## Fork Awesome