diff --git a/gemcompiler.sh b/gemcompiler.sh
index 8f3f5a9..243764a 100644
--- a/gemcompiler.sh
+++ b/gemcompiler.sh
@@ -1,6 +1,7 @@
 #!/bin/sh
 
 export PATH=usr/lib/ccache/bin:$PATH
+PLATFORM=`ruby -e "puts RbConfig::CONFIG['arch']"`
 
 cd /srv/gems
 
@@ -8,8 +9,8 @@ test -f ${GEM}-${VERSION}.gem \
   || gem fetch --source=https://rubygems.org --platform=ruby \
                --version ${VERSION} ${GEM}
 
-test -f ${GEM}-${VERSION}-`uname -m`-linux.gem \
+test -f ${GEM}-${VERSION}-${PLATFORM}.gem \
   || gem compile -V --prune ${GEM}-${VERSION}.gem
 
-gem inabox ${GEM}-${VERSION}-`uname -m`-linux.gem \
+gem inabox ${GEM}-${VERSION}-${PLATFORM}.gem \
   --host https://${HTTP_BASIC_USER}:${HTTP_BASIC_PASSWORD}@gems.${SUTTY}