diff --git a/install.sh b/install.sh
index a214387..22ba040 100755
--- a/install.sh
+++ b/install.sh
@@ -1,11 +1,21 @@
 #!/bin/bash
 
-read -p "Do you want to install Frost [Y/n]?" yn
+read -p "Do you want to install Frost [Y/n]? " yn
 
-if [[ $yn =~ ^[Yy]$ ]] || [[ $yn == "" ]]; then
+case "$yn" in
+    y|Y|yes|YES|"")
+        echo "Copying plank theme..."
+        cp -Ri Frost $HOME/.local/share/plank/themes
+        
+        echo "Done"
+        
+        ;;
+        
+    *)
+        echo "Invalid input"
+        exit 1
+        
+esac
 
-    echo "Copying plank theme..."
-    cp -Ri Frost $HOME/.local/share/plank/themes
-
-    echo "Done"
-fi
+exit 0
+