diff --git a/external/Makefile b/external/Makefile
index 741d1a6..aeb0497 100644
--- a/external/Makefile
+++ b/external/Makefile
@@ -1,6 +1,6 @@
 lorax/branch-$(VERSION):
 	git config advice.detachedHead false
-	cd lorax && git reset --hard HEAD && git checkout $(if $(findstring TRUE,$(_RHEL)),rhel$(VERSION)-branch,tags/$(shell cd lorax && git tag -l lorax-$(VERSION).* --sort=creatordate | tail -n 1))
+	cd lorax && git reset --hard HEAD && git checkout $(if $(findstring true,$(_RHEL)),rhel$(VERSION)-branch,tags/$(shell cd lorax && git tag -l lorax-$(VERSION).* --sort=creatordate | tail -n 1))
 	touch lorax/branch-$(VERSION)
 
 install-deps: