diff --git a/src/backend/net/Makefile.am b/src/backend/net/Makefile.am
index 2cdb2f7cf8..1d254eb9e1 100644
--- a/src/backend/net/Makefile.am
+++ b/src/backend/net/Makefile.am
@@ -2,7 +2,8 @@ SUBDIRS = .
 
 pkglib_LTLIBRARIES = libgncmod-backend-net.la
 
-INCLUDES = \
+CFLAGS = \
+  @CFLAGS@ \
   -I.. -I../.. \
   -I../../engine \
   -I../../gnc-module \