diff --git a/bin/omarchy-theme-install b/bin/omarchy-theme-install
index 0c0f0c4e..5949c7ea 100755
--- a/bin/omarchy-theme-install
+++ b/bin/omarchy-theme-install
@@ -15,7 +15,7 @@ if [[ -z $REPO_URL ]]; then
 fi
 
 THEMES_DIR="$HOME/.config/omarchy/themes"
-THEME_NAME=$(basename "$REPO_URL" .git | sed -E 's/^omarchy-//; s/-theme$//')
+THEME_NAME=$(basename "$REPO_URL" .git | sed -E 's/^omarchy-//; s/-theme$//' | tr '[:upper:]' '[:lower:]')
 THEME_PATH="$THEMES_DIR/$THEME_NAME"
 
 # Remove existing theme if present