diff --git a/build.sh b/build.sh
index a0028c2..6c91683 100755
--- a/build.sh
+++ b/build.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
 mkdir -p build/$1
-rm -r build/$1/*
+rm -rf build/$1/*
 cp -R src/{*.js,*.html,*.css,fonts,images} build/$1/
 cp -R src/platform/$1/* build/$1/