diff --git a/nbi_extension_example/util.py b/nbi_extension_example/util.py
index aad7caa..f847deb 100644
--- a/nbi_extension_example/util.py
+++ b/nbi_extension_example/util.py
@@ -29,7 +29,7 @@
 </svg>
 """
 
-PARTICIPANT_ICON_URL = f"data:image/svg+xml;base64,{base64.b64encode(PARTICIPANT_ICON_SVG.encode("utf-8")).decode('utf-8')}"
+PARTICIPANT_ICON_URL = f"data:image/svg+xml;base64,{base64.b64encode(PARTICIPANT_ICON_SVG.encode('utf-8')).decode('utf-8')}"
 
 def example_matplotlib_image():
 	# Data