diff --git a/Tests/test_imagedraw.py b/Tests/test_imagedraw.py
index 274753c6c..0a699e2ab 100644
--- a/Tests/test_imagedraw.py
+++ b/Tests/test_imagedraw.py
@@ -868,8 +868,10 @@ def test_rounded_rectangle_zero_radius(bbox: Coords) -> None:
     [
         ((20, 10, 80, 90), "x"),
         ((20, 10, 81, 90), "x_odd"),
+        ((20, 10, 81.1, 90), "x_odd"),
         ((10, 20, 90, 80), "y"),
         ((10, 20, 90, 81), "y_odd"),
+        ((10, 20, 90, 81.1), "y_odd"),
         ((20, 20, 80, 80), "both"),
     ],
 )
diff --git a/src/PIL/ImageDraw.py b/src/PIL/ImageDraw.py
index d4e000087..d3efe6486 100644
--- a/src/PIL/ImageDraw.py
+++ b/src/PIL/ImageDraw.py
@@ -336,6 +336,10 @@ class ImageDraw:
 
         d = radius * 2
 
+        x0 = round(x0)
+        y0 = round(y0)
+        x1 = round(x1)
+        y1 = round(y1)
         full_x, full_y = False, False
         if all(corners):
             full_x = d >= x1 - x0 - 1