diff --git a/app/SvgUtils.py b/app/SvgUtils.py
index 31df89d..24a7c35 100644
--- a/app/SvgUtils.py
+++ b/app/SvgUtils.py
@@ -14,7 +14,7 @@
 
 # Process img tags, replacing base64 SVG images with PNGs
 def process_svg(html):
-    pattern = re.compile(r'<img(?P<intermediate>[^>]+?src="data:)(?P<type>[^;>]*?);base64,\s?(?P<base64>[^">]*?)"')
+    pattern = re.compile(r'<img(?P<intermediate>[^>]+?src="data:)(?P<type>[^;>]*?);base64,\s?(?P<base64>[A-Za-z0-9+/=]+)"')
     return re.sub(pattern, replace_img_base64, html)