diff --git a/install.sh b/install.sh
index 73deb48..af49fc6 100755
--- a/install.sh
+++ b/install.sh
@@ -6,6 +6,8 @@ set -o nounset
 set -o errexit
 set -o shwordsplit 2>/dev/null || true  # Make zsh behave like bash
 
+USER=${USER:-$(id -un)}
+
 case $(uname) in
   Linux)
     FINDTYPE="-xtype"