diff --git a/cmd/primitiveRoot.go b/cmd/primitiveRoot.go
index c06338c..c6c9961 100644
--- a/cmd/primitiveRoot.go
+++ b/cmd/primitiveRoot.go
@@ -29,6 +29,10 @@ var modulus string
 var tpf []string
 
 func computeNaive(modulus *big.Int) (*big.Int, error) {
+	if modulus.Cmp(big.NewInt(1)) == 0 {
+		return big.NewInt(0), nil
+	}
+
 	for g := big.NewInt(1); g.Cmp(modulus) == -1; g.Add(g, big.NewInt(1)) {
 		e := big.NewInt(1)
 		exps := make(map[string]big.Int)