diff --git a/cloudinit/sources/DataSourceNoCloud.py b/cloudinit/sources/DataSourceNoCloud.py
index 571e4f9d21c..b2e7e7c20b2 100644
--- a/cloudinit/sources/DataSourceNoCloud.py
+++ b/cloudinit/sources/DataSourceNoCloud.py
@@ -423,7 +423,7 @@ def ds_detect(self):
             deprecated_version="24.1",
             extra_message=(
                 "Use 'nocloud' instead, which uses the seedfrom protocol"
-                "scheme (http// or file://) to decide how to run."
+                "scheme (http:// or file://) to decide how to run."
             ),
         )