diff --git a/config.go b/config.go
index 9fb96b9..48b2aee 100644
--- a/config.go
+++ b/config.go
@@ -76,6 +76,9 @@ func getConfig(filename string) (Config, error) {
 		return config, err
 	}
 
+	// Force hostname to lowercase
+	config.Hostname = strings.ToLower(config.Hostname)
+
 	// Validate pseudo-enums
 	switch config.DirectorySort {
 	case "Name", "Size", "Time":
diff --git a/handler.go b/handler.go
index d476c3b..defea21 100644
--- a/handler.go
+++ b/handler.go
@@ -49,7 +49,7 @@ func handleGeminiRequest(conn net.Conn, config Config, accessLogEntries chan Log
 	}
 
 	// Reject requests for content from other servers
-	if URL.Hostname() != config.Hostname || (URL.Port() != "" && URL.Port() != strconv.Itoa(config.Port)) {
+	if strings.ToLower(URL.Hostname()) != config.Hostname || (URL.Port() != "" && URL.Port() != strconv.Itoa(config.Port)) {
 		conn.Write([]byte("53 No proxying to other hosts or ports!\r\n"))
 		log.Status = 53
 		return