diff --git a/blogs/2022/12/15/stable-diffusion.md b/blogs/2022/12/15/stable-diffusion.md
index feb34c9..543302c 100644
--- a/blogs/2022/12/15/stable-diffusion.md
+++ b/blogs/2022/12/15/stable-diffusion.md
@@ -114,7 +114,7 @@ prompt = " ".join(sys.argv[1:])
 While we're at it, we can also base the filename on the input prompt:
 
 ```python
-image.save(f"{prompt.replace(" ", "_")}.png")
+image.save(f'{prompt.replace(" ", "_")}.png')
 ```
 
 ## Wrapping up