diff --git a/install.sh b/install.sh
index ad3e4ab3a..d84761a2e 100755
--- a/install.sh
+++ b/install.sh
@@ -16,10 +16,10 @@ init_db_final=0
 while [ "$init_db_valid" == 0 ]
 do
   read -p "Initialize database (y/n)? " init_db
-  case "${init_db,,}" in
-    y|yes ) init_db_valid=1; init_db_final=1;;
-    n|no ) init_db_valid=1; init_db_final=0;;
-    * ) echo "Invalid input" 1>&2;;
+  case "$init_db" in
+    [yY]* ) init_db_valid=1; init_db_final=1;;
+    [nN]* ) init_db_valid=1; init_db_final=0;;
+    * ) echo "Invalid input. Please enter either \"y\" or \"n\"." 1>&2;;
   esac
   echo
 done