diff --git a/grpc.go b/grpc.go
index d0b8d1fc..54f17d86 100644
--- a/grpc.go
+++ b/grpc.go
@@ -92,9 +92,9 @@ func (rnr *grpcRunner) Run(ctx context.Context, r *grpcRequest) error {
 			grpc.WithBlock(),
 			grpc.WithUserAgent(fmt.Sprintf("runn/%s", version.Version)),
 		}
-		useTLS := false
-		if strings.HasSuffix(rnr.target, ":443") {
-			useTLS = true
+		useTLS := true
+		if strings.HasSuffix(rnr.target, ":80") {
+			useTLS = false
 		}
 		if rnr.tls != nil {
 			useTLS = *rnr.tls
diff --git a/grpc_test.go b/grpc_test.go
index 2004c3fc..b67eed95 100644
--- a/grpc_test.go
+++ b/grpc_test.go
@@ -242,7 +242,8 @@ func TestGrpcRunner(t *testing.T) {
 		tt := tt
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
-			ts := testutil.GRPCServer(t, false)
+			useTLS := false
+			ts := testutil.GRPCServer(t, useTLS)
 			o, err := New()
 			if err != nil {
 				t.Fatal(err)
@@ -252,6 +253,7 @@ func TestGrpcRunner(t *testing.T) {
 				t.Fatal(err)
 			}
 			r.operator = o
+			r.tls = &useTLS
 			if err := r.Run(ctx, tt.req); err != nil {
 				t.Error(err)
 			}