diff --git a/tools/makefile b/tools/makefile
index 148b489..db02ea5 100644
--- a/tools/makefile
+++ b/tools/makefile
@@ -5,6 +5,7 @@ cmd_typescript_compile := tsc
 cmd_concatenate := cat
 cmd_chmod := chmod
 cmd_echo := echo -e
+cmd_echox := echo
 cmd_log := echo -e "--"
 
 
@@ -29,7 +30,7 @@ source/main.ts
 build/sindri: lib/plankton/plankton.js temp/sindri-unlinked.js
 	@ ${cmd_log} "linking …"
 	@ ${cmd_create_directory} build
-	@ ${cmd_echo} "#!/usr/bin/env node\n" > temp/head.js
+	@ ${cmd_echox} "#!/usr/bin/env node\n" > temp/head.js
 	@ ${cmd_concatenate} temp/head.js $^ > $@
 	@ ${cmd_chmod} +x $@