diff --git a/totp.go b/totp.go
index 10a2876..c3d6f3f 100644
--- a/totp.go
+++ b/totp.go
@@ -123,12 +123,11 @@ func totpFromURL(u *url.URL) (*TOTP, string, error) {
 
 	var algo = crypto.SHA1
 	if algorithm := v.Get("algorithm"); algorithm != "" {
-		switch {
-		case algorithm == "SHA256":
+		if strings.EqualFold(algorithm, "SHA256") {
 			algo = crypto.SHA256
-		case algorithm == "SHA512":
+		} else if strings.EqualFold(algorithm, "SHA512") {
 			algo = crypto.SHA512
-		case algorithm != "SHA1":
+		} else if !strings.EqualFold(algorithm, "SHA1") {
 			return nil, "", ErrInvalidAlgo
 		}
 	}