diff --git a/Forge.OpenAI/Services/ImageService.cs b/Forge.OpenAI/Services/ImageService.cs
index 0ab0930..317cab9 100644
--- a/Forge.OpenAI/Services/ImageService.cs
+++ b/Forge.OpenAI/Services/ImageService.cs
@@ -157,7 +157,7 @@ private async Task<HttpContent> ImageEditHttpContentFactoryAsync(ImageEditReques
             content.Add(new StringContent(imageEditRequest.NumberOfEditedImages.ToString()), "n");
 
             if (!string.IsNullOrWhiteSpace(imageEditRequest.Size)) content.Add(new StringContent(imageEditRequest.Size), "size");
-            if (!string.IsNullOrWhiteSpace(imageEditRequest.ResponseFormat)) content.Add(new StringContent(imageEditRequest.Size), "response_format");
+            if (!string.IsNullOrWhiteSpace(imageEditRequest.ResponseFormat)) content.Add(new StringContent(imageEditRequest.ResponseFormat), "response_format");
             if (!string.IsNullOrWhiteSpace(imageEditRequest.User)) content.Add(new StringContent(imageEditRequest.User), "user");
 
             return content;