diff --git a/mcp_video_editor/server.py b/mcp_video_editor/server.py
index 4b84d38..0f72703 100644
--- a/mcp_video_editor/server.py
+++ b/mcp_video_editor/server.py
@@ -359,27 +359,20 @@ def mcp_video_add_overlay(
 
         with VideoFileClip(input_path) as clip:
             if overlay_type == "text" and text:
-                # Default style
-                default_style = {"fontsize": 50, "color": "white", "font": "Arial-Bold"}
+                # Default style (corrected parameter names)
+                default_style = {"font_size": 50, "color": "white"}
                 if style:
                     default_style.update(style)
 
-                # Create text clip
-                txt_clip = (
-                    TextClip(
-                        text,
-                        fontsize=default_style["fontsize"],
-                        color=default_style["color"],
-                        font=default_style["font"],
-                    )
-                    .set_position(position)
-                    .set_start(start_time)
-                )
+                # Create text clip with correct syntax
+                txt_clip = TextClip(
+                    text=text,
+                    font_size=default_style["font_size"],
+                    color=default_style["color"],
+                    duration=duration or (clip.duration - start_time)
+                ).with_position(position).with_start(start_time)
 
-                if duration:
-                    txt_clip = txt_clip.set_duration(duration)
-                else:
-                    txt_clip = txt_clip.set_duration(clip.duration - start_time)
+                # Duration is already set in TextClip constructor
 
                 # Composite video with text overlay
                 final_clip = CompositeVideoClip([clip, txt_clip])