diff --git a/install.sh b/install.sh
index fb6c852..8809178 100755
--- a/install.sh
+++ b/install.sh
@@ -25,8 +25,8 @@ fi
 
 # Copy Karabiner settings.
 echo "Copying Karabiner settings..."
-if [[ $OSX_VERSION -ge 12 ]]; then
-  mkdir -p ~/.karabiner.d/configuration
+if (( $(echo "$OSX_VERSION > 12" | bc -l) )); then
+mkdir -p ~/.karabiner.d/configuration
   cp karabiner.json ~/.karabiner.d/configuration/karabiner.json
 else
   mkdir -p ~/Library/Application\ Support/Karabiner