diff --git a/.gitignore b/.gitignore
index edf3c05..480df8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,5 +18,6 @@ cover/
 *.so
 venv/
 .venv/
+demo.*
 .coverage
 coverage.xml
diff --git a/src/captcha/image.py b/src/captcha/image.py
index 84de254..51fdee0 100644
--- a/src/captcha/image.py
+++ b/src/captcha/image.py
@@ -103,10 +103,7 @@ class ImageCaptcha:
             draw: ImageDraw,
             color: ColorTuple) -> Image:
         font = random.choice(self.truefonts)
-
-        left, top, right, bottom = draw.textbbox((0, 0), c, font=font)
-        w = int((right - left)*1.7) or 1
-        h = int((bottom - top)*1.7) or 1
+        _, _, w, h = draw.multiline_textbbox((1, 1), c, font=font)
 
         dx1 = random.randint(0, 4)
         dy1 = random.randint(0, 6)