diff --git a/modules/images.py b/modules/images.py
index 4be0e74d..ae3cdaf4 100644
--- a/modules/images.py
+++ b/modules/images.py
@@ -171,8 +171,8 @@ def draw_grid_annotations(im, width, height, hor_texts, ver_texts):
 
     pad_left = 0 if sum([sum([len(line.text) for line in lines]) for lines in ver_texts]) == 0 else width * 3 // 4
 
-    cols = round(im.width / width)
-    rows = round(im.height / height)
+    cols = im.width // width
+    rows = im.height // height
 
     assert cols == len(hor_texts), f'bad number of horizontal texts: {len(hor_texts)}; must be {cols}'
     assert rows == len(ver_texts), f'bad number of vertical texts: {len(ver_texts)}; must be {rows}'
diff --git a/scripts/prompt_matrix.py b/scripts/prompt_matrix.py
index f6575b6b..50c7f3cb 100644
--- a/scripts/prompt_matrix.py
+++ b/scripts/prompt_matrix.py
@@ -78,8 +78,8 @@ class Script(scripts.Script):
         p.prompt_for_display = original_prompt
         processed = process_images(p)
 
-        grid = images.image_grid(processed.images, p.batch_size, rows=1 << ((len(prompt_matrix_parts) - 1) // 2))
-        grid = images.draw_prompt_matrix(grid, max(p.width, p.hr_upscale_to_x), max(p.height, p.hr_upscale_to_y), prompt_matrix_parts)
+        grid = images.image_grid(processed.images, p.batch_size, rows=1 << ((len(prompt_matrix_parts) - 1) // 2)) 
+        grid = images.draw_prompt_matrix(grid, processed.images[0].width, processed.images[1].height, prompt_matrix_parts)
         processed.images.insert(0, grid)
         processed.index_of_first_image = 1
         processed.infotexts.insert(0, processed.infotexts[0])