diff --git a/setup/common.sh b/setup/common.sh
index 471ac7e..ac19c3b 100755
--- a/setup/common.sh
+++ b/setup/common.sh
@@ -269,6 +269,15 @@ function ensure_file_exists {
   fi
 }
 
+function ensure_file_missing {
+  local -r FILE="${1}"
+
+  if [[ -f "${FILE}" ]]; then
+    log_error "File ${FILE} already exists."
+    exit 1
+  fi
+}
+
 function windows_env_value {
   local -r VAR="${1}"
   local value="$(/mnt/c/Windows/System32/cmd.exe /C "echo %${VAR}%")"
diff --git a/setup/resources/apache/make-site.sh b/setup/resources/apache/make-site.sh
index 093afee..4e151a9 100755
--- a/setup/resources/apache/make-site.sh
+++ b/setup/resources/apache/make-site.sh
@@ -29,6 +29,7 @@ fi
 ensure_root
 ensure_installed "Apache"
 ensure_file_exists "${STUB_FILE}"
+ensure_file_missing "${NEW_SITE_CONFIG}"
 
 log_info "Setting up new site config file."