diff --git a/unimplemented.sh b/unimplemented.sh
index 5252de4b2..fee21d24e 100644
--- a/unimplemented.sh
+++ b/unimplemented.sh
@@ -1,4 +1,4 @@
 #!/bin/sh
 
-echo >&2 "fatal: git was built without support for `basename $0` (@@REASON@@)."
+echo >&2 "fatal: git was built without support for $(basename $0) (@@REASON@@)."
 exit 128