diff --git a/internal/llm/provider/gemini.go b/internal/llm/provider/gemini.go
index a5e6ed87..5492b474 100644
--- a/internal/llm/provider/gemini.go
+++ b/internal/llm/provider/gemini.go
@@ -332,7 +332,7 @@ func (g *geminiClient) stream(ctx context.Context, messages []message.Message, t
 						switch p := part.(type) {
 						case genai.Text:
 							newText := string(p)
-							delta := newText[len(currentContent):]
+							delta := newText
 							if delta != "" {
 								eventChan <- ProviderEvent{
 									Type:    EventContentDelta,