diff --git a/Makefile b/Makefile
index e5ca6eb..ccff880 100644
--- a/Makefile
+++ b/Makefile
@@ -3,6 +3,8 @@ HDRS := $(wildcard *.hpp)
 PREFIX ?= /usr/local
 INCLUDEDIR ?= $(PREFIX)/include
 
-install: $(HDRS)
-	mkdir -p $(INCLUDEDIR)/sc
-	install -c -m 0666 $(HDRS) $(INCLUDEDIR)/sc
+install: $(INCLUDEDIR)/sc $(HDRS)
+	install -c -m 0644 $(HDRS) $(INCLUDEDIR)/sc
+
+$(INCLUDEDIR)/sc:
+	install -m 0755 -d $@