diff --git a/internal/transformer/convert/openai_openai2.go b/internal/transformer/convert/openai_openai2.go
index 8c585376..45a3d4cb 100644
--- a/internal/transformer/convert/openai_openai2.go
+++ b/internal/transformer/convert/openai_openai2.go
@@ -108,6 +108,9 @@ func OpenAI2ReqToOpenAI(openai2Req []byte, model string) ([]byte, error) {
 					pendingToolCalls = nil
 				}
 				role, _ := itemMap["role"].(string)
+				if role == "developer" {
+					role = "system"
+				}
 				text := extractOpenAI2Text(itemMap["content"])
 				messages = append(messages, transformer.OpenAIMessage{Role: role, Content: text})