diff --git a/lib/make-iso9660-image.sh b/lib/make-iso9660-image.sh
index 01b0fafa1123..c6996e8db9a5 100644
--- a/lib/make-iso9660-image.sh
+++ b/lib/make-iso9660-image.sh
@@ -54,7 +54,7 @@ done
 
 # Also include a manifest of the closures in a format suitable for
 # nix-store --load-db.
-if [ -n "$object"; ]; then
+if [ -n "$object" ]; then
     printRegistration=1 perl $pathsFromGraph closure-* > nix-path-registration
     echo "nix-path-registration=nix-path-registration" >> pathlist
 fi