diff --git a/Makefile b/Makefile
index 51ed33e..f632998 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ VERSION = $(shell git describe | sed 's/-/./g')
 BRANCH = $(shell git branch --show-current)
 
 define rpm_eval
-shell rpm --eval '%{$(1)}'
+	shell rpm --eval '%{$(1)}'
 endef
 
 TARBALL_PATH = $(call rpm_eval _sourcedir)/$(NAME)-$(VERSION).tar.gz