diff --git a/nixos/doc/manual/configuration/matrix.xml b/nixos/doc/manual/configuration/matrix.xml
index 40dd1406bb63..ef8d5cbda889 100644
--- a/nixos/doc/manual/configuration/matrix.xml
+++ b/nixos/doc/manual/configuration/matrix.xml
@@ -95,7 +95,7 @@ in {
 
         # forward all Matrix API calls to the synapse Matrix homeserver
         locations."/_matrix" = {
-          proxyPass = "http://[::1]:8008/_matrix";
+          proxyPass = "http://[::1]:8008"; # without a trailing /
         };
       };
     };