diff --git a/tests/functional/local.mk b/tests/functional/local.mk
index e36323a45..8bb8e3600 100644
--- a/tests/functional/local.mk
+++ b/tests/functional/local.mk
@@ -130,7 +130,7 @@ nix_tests = \
   nested-sandboxing.sh \
   impure-env.sh \
   debugger.sh \
-	help.sh
+  help.sh
 
 ifeq ($(HAVE_LIBCPUID), 1)
   nix_tests += compute-levels.sh