diff --git a/src/libsodium/Makefile.am b/src/libsodium/Makefile.am
index 103f8297..b9433591 100644
--- a/src/libsodium/Makefile.am
+++ b/src/libsodium/Makefile.am
@@ -82,8 +82,7 @@ libsodium_la_LDFLAGS = \
 
 libsodium_la_CPPFLAGS = \
 	$(LTDLINCL) \
-	-I. \
-	-Iinclude/sodium
+	-I$(top_srcdir)/src/libsodium/include/sodium
 
 SUBDIRS = \
 	include