diff --git a/ldm/generate.py b/ldm/generate.py
index 78a691dbeb..9471d01f87 100644
--- a/ldm/generate.py
+++ b/ldm/generate.py
@@ -840,7 +840,7 @@ class Generate:
             print(
                 f'>> using provided input image of size {image.width}x{image.height}'
             )
-        elif isinstance(image, str):
+        elif isinstance(img, str):
             assert os.path.exists(img), f'>> {img}: File not found'
 
             image = Image.open(img)