diff --git a/ui/media/js/main.js b/ui/media/js/main.js
index e59a6ace..755bca2f 100644
--- a/ui/media/js/main.js
+++ b/ui/media/js/main.js
@@ -623,6 +623,13 @@ function onUseAsInputClick(req, img) {
     initImagePreview.src = imgData
 
     maskSetting.checked = false
+
+    //Force the image settings size to match the input, as inpaint currently only works correctly
+    //if input image and generate sizes match.
+    addImageSizeOption(img.naturalWidth);
+    addImageSizeOption(img.naturalHeight);
+    widthField.value = img.naturalWidth;
+    heightField.value = img.naturalHeight;
 }
 
 function onUseForControlnetClick(req, img) {