diff --git a/index/gt/gtkada/gtkada-external.toml b/index/gt/gtkada/gtkada-external.toml
index c3b01346..fe2134ae 100644
--- a/index/gt/gtkada/gtkada-external.toml
+++ b/index/gt/gtkada/gtkada-external.toml
@@ -6,8 +6,8 @@ maintainers-logins = ["mosteo"]
 
 [[external]]
 kind = "system"
-[external.available."case(toolchain)"]
-user = false
+available."case(toolchain)".user = false
+
 [external.origin."case(distribution)"]
 debian = ["libgtkada18-dev"]
-ubuntu = ["libgtkada16.1.0-dev"]
+ubuntu = ["libgtkada16.1.0-dev", "libgtkada19-dev"]