diff --git a/cmd/jwt/main.go b/cmd/jwt/main.go
index 8b16b22..da48b49 100644
--- a/cmd/jwt/main.go
+++ b/cmd/jwt/main.go
@@ -293,7 +293,7 @@ func isRs() bool {
 }
 
 func isEd() bool {
-	return strings.HasPrefix(strings.ToUpper(*flagAlg), "Ed")
+	return *flagAlg == "EdDSA"
 }
 
 type ArgList map[string]string