diff --git a/Makefile.am b/Makefile.am
index 7824ecb0..119b8786 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,7 @@
 SUBDIRS = build
 
 ACLOCAL_AMFLAGS = -I m4
+AUTOMAKE_OPTIONS = subdir-objects
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = $(top_builddir)/libtoxcore.pc