diff --git a/src/libsodium/Makefile.am b/src/libsodium/Makefile.am
index 08eea70f..7570a45f 100644
--- a/src/libsodium/Makefile.am
+++ b/src/libsodium/Makefile.am
@@ -166,7 +166,8 @@ libsodium_la_LDFLAGS = \
 
 libsodium_la_CPPFLAGS = \
 	$(LTDLINCL) \
-	-I$(top_srcdir)/src/libsodium/include/sodium
+	-I$(srcdir)/include/sodium \
+	-I$(builddir)/include/sodium
 
 SUBDIRS = \
 	include