diff --git a/internal/service/requests/get_proof_parameters.go b/internal/service/requests/get_proof_parameters.go
index 4579c56..24cdc8c 100644
--- a/internal/service/requests/get_proof_parameters.go
+++ b/internal/service/requests/get_proof_parameters.go
@@ -24,7 +24,7 @@ func NewGetUserInputs(r *http.Request) (userInputs UserInputs, err error) {
 		return
 	}
 	err = val.Errors{
-		"user_id":         val.Validate(userInputs.UserId, val.Required, is.Email),
+		"user_id":         val.Validate(userInputs.UserId, val.Required),
 		"age_lower_bound": val.Validate(userInputs.AgeLowerBound, val.Required),
 		"uniqueness":      val.Validate(val.Required),
 		"nationality":     val.Validate(userInputs.Nationality, val.Required),