diff --git a/ruby-oj/PKGBUILD b/ruby-oj/PKGBUILD
index 9e9284e..173585c 100644
--- a/ruby-oj/PKGBUILD
+++ b/ruby-oj/PKGBUILD
@@ -32,7 +32,7 @@ package() {
 
   # delete unnecessary files & folders
   # TODO: investigate gem.build_complete (gem_build_complete_path)
-  rm -vrf "extensions/$(uname -m)-linux/$(basename $(ruby -e'puts Gem.default_dir'))/$_gemname-$pkgver/gem_make.out"
+  rm -vrf "extensions/$CARCH-linux/$(basename $(ruby -e'puts Gem.default_dir'))/$_gemname-$pkgver/gem_make.out"
   cd "gems/$_gemname-$pkgver"
   rm -vrf test ext