diff --git a/src/libnsdb/Makefile.am b/src/libnsdb/Makefile.am
index 9387dba..c98d0e7 100644
--- a/src/libnsdb/Makefile.am
+++ b/src/libnsdb/Makefile.am
@@ -35,4 +35,4 @@ DISTCLEANFILES		= Makefile.in
 AM_CFLAGS		= -ggdb -fstrict-aliasing \
 			  -Wall -Wextra -pedantic -Wformat=2 \
 			  -Wstrict-aliasing=2 -Wp,-D_FORTIFY_SOURCE=2
-AM_CPPFLAGS		= -I. -I$(top_srcdir)/src/include
+AM_CPPFLAGS		= -I. -I$(top_srcdir)/src/include -I/usr/include/tirpc