diff --git a/cuit/validations.go b/cuit/validations.go
index f92f5fc..cb0563d 100644
--- a/cuit/validations.go
+++ b/cuit/validations.go
@@ -48,7 +48,7 @@ func validateWithVerifierDigit(cuit string) bool {
 		}
 		weightUpResult += weightUp * weightUpCheckFactor[i-6*weightUpFactorCounter]
 	}
-	mod11WeightupResult := weightUpResult % 11
+	mod11WeightupResult := 11 - (weightUpResult % 11)
 
 	switch mod11WeightupResult {
 	case 11:
@@ -56,7 +56,7 @@ func validateWithVerifierDigit(cuit string) bool {
 	case 10:
 		verificationResult = verifierDigit == 9
 	default:
-		verificationResult = verifierDigit == 11-mod11WeightupResult
+		verificationResult = verifierDigit == mod11WeightupResult
 	}
 
 	return verificationResult