diff --git a/Makefile b/Makefile
index 7e5b199..6ee4feb 100644
--- a/Makefile
+++ b/Makefile
@@ -69,7 +69,7 @@ clean:
 
 install: libowfat.a
 	install -d $(INCLUDEDIR) $(MAN3DIR) $(LIBDIR)
-	install -m 644 buffer.h byte.h fmt.h ip4.h ip6.h mmap.h open.h scan.h socket.h str.h stralloc.h uint16.h uint32.h uint64.h open.h $(prefix)/include
+	install -m 644 buffer.h byte.h fmt.h ip4.h ip6.h mmap.h scan.h socket.h str.h stralloc.h uint16.h uint32.h uint64.h open.h $(INCLUDEDIR)
 	install -m 644 $(wildcard */*.3) $(MAN3DIR)
 	install -m 644 libowfat.a $(LIBDIR)