diff --git a/gptscript_test.go b/gptscript_test.go
index 938f5e6..9a667da 100644
--- a/gptscript_test.go
+++ b/gptscript_test.go
@@ -774,7 +774,7 @@ func TestConfirm(t *testing.T) {
 func TestConfirmDeny(t *testing.T) {
 	var eventContent string
 	tools := ToolDef{
-		Instructions: "List the files in the current directory",
+		Instructions: "List the files in the current directory as '.'. If that doesn't work print the word FAIL.",
 		Tools:        []string{"sys.exec"},
 	}
 
@@ -828,11 +828,11 @@ func TestConfirmDeny(t *testing.T) {
 		t.Errorf("Error reading output: %v", err)
 	}
 
-	if !strings.Contains(strings.ToLower(eventContent), "authorization error") {
+	if !strings.Contains(strings.ToLower(eventContent), "fail") {
 		t.Errorf("Unexpected event output: %s", eventContent)
 	}
 
-	if !strings.Contains(strings.ToLower(out), "authorization error") {
+	if !strings.Contains(strings.ToLower(out), "fail") {
 		t.Errorf("Unexpected output: %s", out)
 	}
 
diff --git a/opts.go b/opts.go
index 03f2cd4..3df9467 100644
--- a/opts.go
+++ b/opts.go
@@ -18,7 +18,7 @@ func (g GlobalOptions) toEnv() []string {
 		args = append(args, "OPENAI_BASE_URL="+g.OpenAIBaseURL)
 	}
 	if g.DefaultModel != "" {
-		args = append(args, "GPTSCRIPT_DEFAULT_MODEL="+g.DefaultModel)
+		args = append(args, "GPTSCRIPT_SDKSERVER_DEFAULT_MODEL="+g.DefaultModel)
 	}
 
 	return args