diff --git a/Makefile b/Makefile
index cbba9b05..4888b8a5 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ check:
 setup: .git/hooks/pre-commit
 	@cp bin/pre-commit.hook .git/hooks/pre-commit
 
-SUBDIRS := $(shell find -maxdepth 2 -mindepth 2 -name 'Makefile' -printf '%h/.\n')
+SUBDIRS := $(dir $(wildcard */Makefile))
 TARGETS := install clean test lint # whatever else, but must not contain '/'
 
 # foo/.all bar/.all foo/.clean bar/.clean