diff --git a/testsuite/fixtures/system_index/gn/gnat_external/gnat_external-external.toml b/testsuite/fixtures/system_index/gn/gnat_external/gnat_external-external.toml
index f1171a6ba..6a899f8d1 100644
--- a/testsuite/fixtures/system_index/gn/gnat_external/gnat_external-external.toml
+++ b/testsuite/fixtures/system_index/gn/gnat_external/gnat_external-external.toml
@@ -6,7 +6,6 @@ maintainers-logins = ["mosteo"]
 
 [[external]]
 kind = "version-output"
-# We look for make instead that should be always installed.
-version-command = ["make", "--version"]
-version-regexp = ".*Make ([\\d\\.]+).*"
+version-command = ["echo", "1.0"]
+version-regexp = "([\\d\\.]+).*"
 provides = "gnat"